Abstract: This paper describes the basic principle of the Agent techology and its application. Agricultural system is complex,the factors involved are alternating and synergic. To deal with the problems in agricultural system and to model virtual plant better, after the summarization of the principle and application of Agent technology, this paper proposes the idea of constructing virtual plant model based on Agent technology, provides the frame model of Agent plant, and describes the method of applying Agent technology to developing virtual plant model.