China's Patent Examination Guidelines are the official technical standard CNIPA examiners use to determine whether patent applications meet the conditions for grant — and the "industry constitution" that patent attorneys must follow when drafting applications. Although the document is voluminous (over 700 pages in full), its core logic is not complicated. Once the key principles are understood, allowance rates improve substantially.

This article focuses on the chapters of the Examination Guidelines that most directly affect patent drafting, combining the 2023 amendment highlights and the newest rules effective January 2026 to provide practical guidance for practitioners.

The Two Core Articles of PRC Patent Law

Of the PRC Patent Law (2021 amendment), Articles 22 and 26 have the most direct impact on patent application drafting.

Article 22: Substantive Conditions for Grant

PRC Patent Law Article 22 provides that inventions and utility models granted patent rights must possess novelty, inventive step, and industrial applicability.

Novelty (Article 22(2)): The invention or utility model does not form part of the prior art, and no unit or individual has filed an application with the patent administration department of the State Council for the same invention or utility model before the filing date that is recorded in the patent application documents published or the patent documents announced after the filing date.

Inventive step (Article 22(3)): The invention has prominent substantive features and represents a notable advance. The examiner's test is whether the invention is "non-obvious" to a person skilled in the relevant technical field relative to the prior art.

The three-step approach for assessing inventive step (as specified in the Examination Guidelines):

Identify the closest prior art
Identify the distinguishing technical features of the invention and the actual technical problem solved
Determine whether a person skilled in the art would have been motivated to combine the prior art with common general knowledge to arrive at the invention in an obvious manner

This three-step approach directly influences drafting strategy: when drafting independent claims, the distinguishing technical features should be clearly identified, and the specification should fully explain the "technical effect" brought about by those distinguishing features to avoid a finding of simple combination.

Article 26: Form and Content Requirements for the Application

PRC Patent Law Article 26 specifies the drafting requirements for the specification and is the direct basis for examining application document quality.

Article 26(3) (Sufficient disclosure): The specification must give a clear and complete description of the invention or utility model such that a person skilled in the relevant technical field can implement it; drawings shall be provided where necessary.

"Capable of implementation" is the core standard — the specification must disclose sufficient technical information to enable a person skilled in the art to reproduce the invention without undue experimentation.

Article 26(4) (Claims support): The claims shall be supported by the specification and shall clearly and concisely define the scope of patent protection requested.

The scope of protection claimed cannot exceed what is actually disclosed in the specification. This is one of the most common grounds for rejection of Chinese patent applications.

Drafting Standards for the Five Core Specification Sections

The core sections of an invention patent specification and their drafting requirements are as follows:

Technical Field

Clearly state the technical field to which the invention belongs — typically one or two sentences. The standard formulation is: "The present invention relates to [technical field], and more specifically to [more specific technical direction]."

Common error: Writing the technical field too broadly (e.g., "The present invention relates to the field of computer technology" — overly broad for a specific image recognition algorithm) or too narrowly (which can limit search coverage in that technical field).

Background Art

Describe the current state of the art and its deficiencies, providing a basis for the necessity of the invention. When citing references, the 2023 Examination Guidelines unified the citation rules for both Chinese and foreign patent documents: regardless of origin, cited documents must have a publication date no later than the publication date of the present application.

Drafting points:

Identify specific technical problems in the prior art rather than vaguely noting that "the prior art is imperfect"
Prior art documents cited should be published literature where possible, not self-described "known technology"
Technical problems mentioned in the background art section should correspond to problems solved in the summary of the invention section

Summary of the Invention

This is the most critical section of the specification and must contain three necessary subsections:

Technical problem: The technical problem to be solved by the invention, corresponding to the deficiencies identified in the background art.

Technical solution: A textual description corresponding to the independent claims, typically consistent with the independent claims.

Beneficial effects: The advantages and advances of the invention relative to the prior art. Beneficial effects must be supported by the embodiments in the specification and cannot rest solely on subjective assertions.

Drafting point: The more specific the description of beneficial effects, the better. "Improves efficiency" is far less convincing than "under [specific test conditions], speed improved by 30%" — and the latter is also more effective at supporting an inventive step argument.

Description of Drawings and Detailed Description of Embodiments

The detailed description of embodiments is the primary carrier of sufficient disclosure and the direct basis for claims support.

Requirement Dimension	Standard Content
Number of embodiments	Sufficient embodiments to cover different technical solutions within the scope of the independent claims
Reference numerals	Each reference numeral in the specification corresponds one-to-one with its figure; the same component uses the same numeral across all figures
Embodiments vs. claims correspondence	Each technical feature in the claims must be clearly described in at least one embodiment
Support for parameter ranges	Parameter ranges in claims (e.g., "0.1–10%") should be supported by embodiments covering different endpoints or intermediate values within the range

Common issue: A claim uses functional language (e.g., "a processing module configured to perform..."), but the specification contains only one specific implementation. In this case, the functional language may be found to exceed the scope of what the specification discloses, causing the claim to lack support.

Core Standards for Drafting Claims

The claims are the document with the most direct legal effect in a patent application; their drafting quality directly determines the patent's protective value.

Structure of Independent Claims

The standard structure for Chinese patent independent claims includes a preamble and a characterizing part:

Claim 1:
A [invention title], characterized in that [description of technical features distinguishing from the prior art].

Or using the two-part form with preamble and characterizing part:

Claim 1:
A [invention title], comprising/including [known technical features], characterized in that [distinguishing technical features].

Clarity Requirements for Claims

The Examination Guidelines specify clear requirements for clarity of claims. Common violations include:

Issue Type	Example	Suggested Remedy
Relative language	"A high-power motor" ("high" is relative)	Replace with specific parameters or a more precisely defined expression
Unclear step sequence	Steps in a method claim without clear order	Add step numbers or sequential connectives such as "subsequently," "thereafter"
Unclear reference	A dependent claim references a nonexistent claim number	Verify that all cross-references are consistent
One-sided limitation	"X greater than A" (no upper limit)	Assess whether an upper limit is needed
Missing essential technical features	An independent claim omits a technical feature essential to achieve the technical effect	Revisit and identify the minimum set of essential features

Rules for Functional Language

The Examination Guidelines permit functional language in claims, with restrictions:

All implementations covered by functional language must be either clearly described in the specification or constitute common general knowledge in the field
If functional language covers multiple substantially different implementations, the specification must sufficiently disclose each implementation
In computer software, "module/unit for [function]" expressions are widely used, but each "module" must have a corresponding specific implementation described in the specification

Key Claims Changes in the 2023 Examination Guidelines

The 2023 Examination Guidelines (effective January 20, 2024) include important updates to claims examination:

Enhanced reasoning requirements for inventive step: Changed "has reason to suspect" to "has sufficient reason to suspect" — examiners must provide more thorough reasoning when finding that claims lack support from the specification, raising the examiner's burden of proof and benefiting applicants.

Genetic resources in claims: Improved definitions and provisions for genetic resources; invention patent applications involving the source of genetic resources should disclose this in the request.

Intelligent medical field rules: Improved examination rules for disease diagnosis methods; clarified the patentability boundaries for medical diagnostic method claims implemented by computer.

New Rules Effective January 2026

CNIPA issued Announcement No. 84 on November 13, 2025, further amending the Patent Examination Guidelines with effect from January 1, 2026. Key changes include:

Refined Inventive Step Assessment

Standards for recognizing "technical suggestion" in inventive step assessment have been refined, requiring examiners to provide more specific technical grounds when finding that "a person skilled in the art would have been motivated to combine prior art" — rather than relying on inference alone. This benefits applicants in high-technology fields such as AI, biotechnology, and semiconductors.

Improved Handling of Same-Day Dual Filings

Rules for handling same-day filings of both an invention and a utility model for the same subject matter have been improved, clarifying the timing arrangements and rights declaration requirements for examining the invention application when the utility model has already been granted.

Disclosure Requirements for AI-Related Inventions

As AI invention applications continue to grow, the new rules impose more specific technical feature description requirements for patent applications involving artificial intelligence models:

Types and sources of training data should be disclosed in the specification (complete datasets are not required, but data characteristics must be described)
Key parameters of the model architecture should be recorded in the embodiments
Technical effects should be supported by quantifiable verification data, rather than described solely through theoretical derivation

Key Compliance Points for the Five-Document Format

Each of the five documents in an invention patent application (specification abstract, abstract drawing, claims, specification, specification drawings) has format requirements:

Document	Key Format Requirements
Abstract	No more than 300 Chinese characters; no claims-style language; should reflect the technical solution and main technical effects
Abstract drawing	The drawing that best illustrates the technical features of the invention; reference numerals must match the specification
Claims	Each claim ends with a period; independent claims generally precede dependent claims
Specification	A4 paper; font no smaller than small No. 4; appropriate line spacing; section sequence: Technical Field → Background Art → Summary of the Invention → Brief Description of Drawings → Detailed Description of Embodiments
Specification drawings	Line drawings (not photographs); reference numerals in Arabic numerals; each component has a unique numeral within each drawing

Commonly overlooked details:

Numerals in the claims should use Arabic numbers, not Chinese characters
Drawings may not contain textual explanations (reference numeral labels are permitted)
Section headings in the specification must use the prescribed standard format and may not be invented by the applicant

Practical Strategies for Improving Allowance Rates

Based on CNIPA examination practice, the following strategies significantly improve the likelihood of an invention patent being granted:

Strategy 1: Broad-narrow claim layering Draft the independent claims broadly (covering the widest possible scope of the core inventive concept) and the dependent claims narrowly (covering specific preferred embodiments). When facing a narrow allowance, dependent claims may still have protective value; when the broad claim is rejected, the independent claim can be amended to incorporate the limitations of a dependent claim.

Strategy 2: Embodiment-claim mapping During specification drafting, verify that each technical feature in each claim is clearly described in at least one embodiment. Create a "claim → corresponding embodiment" mapping table to ensure nothing is missed.

Strategy 3: Data-supported technical effects Technical effects supported by experimental or comparison data carry significantly more persuasive force when responding to inventive step rejections. When test data is available during drafting, include it in the specification even if it does not appear in the claims.

Strategy 4: Pre-search for the closest prior art Conduct a patent search before drafting to identify the closest prior art, and draft to specifically highlight the distinguishing features. Specifications drafted this way support inventive step arguments more clearly.

Action Checklist: Pre-Submission Compliance Review

Does the independent claim include all essential technical features (would removing any one prevent the technical effect from being achieved)?
Is each technical feature in the claims clearly described in the specification embodiments?
Does the claims scope exceed what is covered by the specification embodiments?
Are reference numerals in drawings completely consistent with numerals in the specification text?
Is the specification abstract within 300 Chinese characters?
Is the logical sequence of steps in method claims clear?
For applications involving AI models, are training data characteristics and key model parameters disclosed in the specification?
Are all cited background art references published before the application's publication date?

CNIPA Patent Drafting Standards: Key Requirements from the Examination Guidelines and 2026 Updates