Abstract: With the development of economic society,the diagnosis and control of landscape plant diseases and pests had become more and more diversified.However,the ways that people could gain information turned out to be extremely few in the marketplace,and it proved to be a very tedious process.Based on ‘My sql’ server database,the system collected not only plentiful expert knowledge in the field of landscape plant diseases and pests,but also abundant mature scientific achievements specially aiming to biological diseases and pests.On the basis of WeChat usage and the openness of WeChat media platform,database technology was used to establish the knowledgeable,scientific,authoritative and interactive platform with main function of diagnosing landscape plant diseases and pests.It would be the efficient practice related to the expert system in new-media platform.And this program had laid a solid foundation for the research of plant diseases and pests and sustainable development of an ecological system.The system combined a layer of user operation(Mini-program on WeChat)and a logical server,with a database of plant diseases and pests,which included hundreds of typical infectious landscape plant diseases and pests.And this system could provide the service for diagnosis,recognition,remedy about landscape plant diseases and pests as well as suggestions concerning controlling them through auxiliary function.It would have considerable economic benefits and a promising future.