Abstract: According to the structural characteristics of greenhouses,it analyzed the distribution of temperature on the spatial and temporal inside the greenhouse,with simplified atmospheric thermal-dynamic equations and numerical methods.The article got a simple solution of the equations and the numerical simulation in different times with the method of separation of variables,through the analysis of the boundary value and initial field of the thermal dynamic conduction equation,which the initial field is derived from the analytical solution of simplified atmospheric thermal-dynamic equations.The article got the time of the model reached the steady state by further analysis.This model can provide a reference for the further study on the microclimate with dynamics method.