To apply for a patent, the necessary application documents must be submitted to China National Intellectual Property Administration in accordance with the regulations. To apply for a patent for invention or utility model, a request, specification, patent right, abstract of specification and necessary drawings shall be submitted. To apply for a patent for design, a request, a design picture or photograph, a brief description and other documents shall be submitted. Patent application documents can be written by the applicant himself or by others. It is suggested to find a patent agency to apply for a patent on its behalf, and the success rate of worry-free authorization will be higher.