In the content of multiple planting experimental data, a dynamic model for HSTP rice is developed, including leaf area development, photosynthesis,respiration, dry matter accumulation and allocation sub-models. Much investigation is made on the relationship between I LA and temperature, simplified calculation for photosynthesis, estimation of net assimilation and variation of dry matter allocation coefficient with phenological stage.In comparison with traditional manual-transplanting (MT) rice, the reason why HSTT rice could reach high yield is revealed in combination with meteorological influence.