| Study on greenhouse microclimate and crop model is a useful tool for optimization of greenhouse crop and climate management. In this study, periodic variation of main microclimate factors (solar radiation, temperature, humidity, CO2 concentration), tomato growth and development and physiology parameters of greenhouse environment in Southern China were observed and analyzed in detail. The model of DM accumulation was built based on mathematic statistic and agricultural meteorology principle.In the model of canopy solar radiation, classical Monsi-Saeki equation was applied for simulating canopy solar distribution. And the model could predict temperature of canopy effectively.LAI model was built based on active accumulated temperature. Leaf photosynthetic rate was calculated by minus exponent equation and parameterεand Pmax were confirmed. Total daily photosynthetic was calculated by Gaussianintegration and photosynthetic model was built. Simulated and measured values of dry matter were compared: result showed that this method could simulate dry matter accumulation exactly.In the model of tomato growth and development, the submodel of phonological, morphology development, leaf development, fruit growth and development were studied. Active accumulated temperature needed of different development stages was found by two tests, simulated values were tested: simulated errors were all less than 2 days. Morphology development of tomato wasdescribed by line equation (y = a + bx) and Logistic equation (W= Wm/(1+ea+bt)),using active accumulated temperature as independent variable, precision was high. At last in the dissertation, existing problems in model and respects need improve in the future were given.
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