Chang Tsi & Partners

Chang Tsi & Partners is a leading full-service Chinese law firm with a strong reputation in intellectual property and litigation. It is headquartered in Beijing, with branches in Shanghai, Guangzhou, Shenzhen and Hong Kong, and two liaisons in the United States. It has had another busy, fruitful year with significant victories in litigation. Its soft IP practice, led by Spring Chang and Simon Tsi, “operates at the highest level of sophistication, creativity and resourcefulness”. One market commentator described the team as “efficient, thorough and practical”. A client noted: “They are the most consistent firm I’ve worked with in terms of accuracy in legal advice, turnaround time, practicality and partnership.” The firm now employs more than 300 attorneys and other professionals practising in English, Chinese and Japanese.

Chang Tsi & Partners has been recognised by well-known media and ranking organisations, including Chambers & Partners Asia Pacific, in which Ms Chang was recognised as Band 1 for Non-litigation Intellectual Property (Chinese firms) in China, Asia Pacific Legal 500 and Asialaw Profiles. The firm operates in all areas of IP rights, including litigation and non-litigation matters. Chang Tsi & Partners was recognised as a Top-Tier Intellectual Property Firm by Legal 500 Asia Pacific in 2017 and 2018, an Outstanding Trademark Agency by the China Trademark Association for consecutive years, a Leading Intellectual Property Firm in both litigation and non-litigation by Chambers & Partners Asia Pacific for consecutive years and one of the best IP firms in China by the China Business Law Journal in 2016.

Being accountable and serving the best interests of clients are the firm’s guiding principles. The firm is fully committed to clients and strives to achieve the best possible results for them with its dedicated professional services. The firm aims to provide practical solutions to all client inquiries. Its competency is built on professional expertise and social resources and it believes that building trust is important for establishing sustainable partnerships.

Intellectual property

Intellectual property is a core focus at Chang Tsi & Partners. The firm’s IP practice is distinguished by its significant patent, trademark, copyright and domain name victories in both contentious and non-contentious matters for leading international organisations. The firm provides comprehensive, one-stop, multi-level legal services.


Chang Tsi & Partners has a strong and growing patent practice and its skilled attorneys process all aspects of patent prosecution and enforcement, including invention patents, utility model patents, design patents, trade secrets, product packaging and decoration, plant varieties, integrated circuit layouts and patent management and transfers, as well as other patent-related matters, including unfair competition. Our attorneys have backgrounds in science, engineering and law. They are well qualified, having passed both the legal and the patent bar exams in China and overseas. Two of our patent practitioners passed the US Patent Bar exam.

Chang Tsi & Partners’ services include:

  • consultation on patent prosecution and enforcement strategies;
  • drafting, review and amendment of legal documents for patent assignment and licensing;
  • patent searches and monitoring;
  • patent applications for inventions, utility models and designs;
  • re-examinations and invalidations;
  • administrative litigation;
  • customs recordal and training services;
  • investigation of patent infringement, including evidence collection;
  • patent infringement litigation;
  • negotiation and other legal services relating to patent licensing and assignment;
  • patent annuity payment and docketing services;
  • patent opinions, including invalidity, non-infringement and freedom-to-operate opinions;
  • legal services and negotiations on licensing and transfers; and
  • design and implementation of global patent protection and licensing strategies.

Corporate law

Chang Tsi & Partners serves as perennial legal counsel to provide legal services for enterprises. The firm’s professionals have extensive experience in corporate establishment, share transactions, M&As, corporate restructuring, industrial relations and corporate debt collection.

Dispute resolution

With years of experience handling litigation and all types of dispute, Chang Tsi & Partners has successfully resolved many complicated patent and commercial disputes for clients. Simon Tsi has been recognised in the Top 15 IP Lawyers and Top 15 Litigators in China by Thomson Reuters’ Asian Legal Business.

Finance and banking

Chang Tsi & Partners serves as legal counsel for a number of leading financial institutions. It is one of five law firms qualified to provide special legal services for syndicated loans selected by the Beijing Banking Association.

Contact details

Chang Tsi & Partners
Floor 6-8
Tower A
Hundred Island Park
Bei Zhan Bei Jie
Xicheng District
Beijing 100044

Professional contacts

Other offices

  • Beijing
  • Guangzhou
  • Hong Kong
  • Shanghai
  • Shenzhen

Sample client list

  • 3M
  • Air China
  • Geely Auto
  • Johnson & Johnson
  • Michael Kors
  • Midea Group
  • Mobike
  • Mondelez International
  • Twitter

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