Abstract: In order to understand and know about the basic principle and quantification relationship of greenhouse phalaenopsis during vegetating phase and forecast the dynamic action of vegetation system so as to assist reasonably regulating and controlling on the vegetation and production system of phalaehopsis real time, a dynamic vegetation model of greenhouse Phalaenopsis is created on the solar radiation as the basic driving factor and a computer simulation system is developed on Windows XP system. The system mainly includes important modules such as solar radiation, carbon assimilation analysis and dry matter partitioning and so on which can output dry matter accumulated value, photosynthesis ratio, leaf area index, quantity of lamina and flower etc parameters and make the model have perfect functions. The computer simulation system uses C++ Builder6.0 as the programming language that makes the interface and function of simulation system uniformed. The simulation experiment and analysis are carried out in the phalaenopsis greenhouse in the New and High Agricultural Technology Demonstration Gardens of Jining City, Shandong Province. The result shows that the simulated result is better fit with the experimental result. The model can dynamically forecast the accumulated quantity of photosynthesis production etc important index of phalaenopsis and it is an important tool to study the vegetation characteristic of phalaenopsis and optimized management.