Abstract: Aimed at existing problems of duplication, inefficiency in agricultural application software development, the component library technique of agricultural was studied and the agricultural component description model was put forward according to the characteristics of agricultural components. Through analyzing the key problems such as retrieval, release, approval, storage, evaluation and feedback functions in detail, the specific methods of building agricultural component library were given and system of component library that adopts MVC framework was developed. At last, application software development was implemented for experiment and the results showed that component library could effectively improve the quality of software development, and at the same time reduce development costs.