Patent application of an enterprise not only aims to search for legal guarantee avoiding unauthorized use of the patent by others, but also intends to search for commercialization of patent by means of license or assignment of technology to achieve maximal value. When an enterprise develops a new product or method, decisionmakers of the enterprise should carefully consider and plan for the following issues: whether the new product or method has market prospects; whether the enterprise should file patent application or adopt technical knowhow; whether there is possibility for followup research and development; whether the enterprise can form patent portfolio of the product or method; when the enterprise shall file the patent application; and how the enterprise shall write the claims.