Under the backgroud of the market and user’〖KG-*2〗s needs are difficult to be obtained,and the construction of produt’〖KG-*2〗s function model severely depends on designer’〖KG-*2〗s knowledge reserve and experience,this patent design around method of using the patent group to assist product’〖KG-*2〗s conceptual design was proposed. Firstly, the relevant patent group was retrieved according to the design theme, then the functional requirements were obtained and classified through analyzing the patents’ abstract, background, summary, etc. Secondly, the patent text was analyzed further based on design task to establish each function model. Then, based on function requirements and original function models,some operations such as comparing, maintenance,deletion, adding, etc were made to reconstruct the function model of the target product. Finally, the tools of TRIZ were applied to solve the problems and then the product’〖KG-*2〗s conceptual model was gotten. And a mesh delivery device was used as an example to verify the feasibility of this method.