Abstract: 【Objective】 Sunlight greenhouse wall heat transfer process is a complex diverse architectural heat physical process. In order to comprehensively analyze the caloric transfer mechanism of solar greenhouse wall, and discuss about the caloric transfer law of the wall, a new two-dimensional heat transfer model is established in this research to simulate and optimize the structure of solar greenhouse. 【Methods】 Simulation of temperature distribution and flow distribution with ansys analysis software, UG software is used to shape solar greenhouses, The structure of top insulation quilt and skeleton is simplified properly, the computational domain is divided into two parts that include internal air and external air. Then the DO radiation model and turbulence model are used to simulate,using CFX-Post calculation processing,the temperature cloud map is obtained. 【Results】 The solar greenhouse wall is a two-dimensional unsteady heat conduction with periodic nonlinear condition internal and external disturbances, the temperature inside the solar greenhouse of two kinds of walls is higher at fourteen o'clock during the day, above 12.0℃,the temperature difference between the walls is small,the convection heat transfer is not obvious. At three o'clock in the night,there is a high temperature area of height 2.2 m、temperature 11.2℃ in the upper part of the block composite wall solar greenhouse floor.With the same distance from the surface of the north wall, the temperature value of block composite wall solar greenhouse is higher than that of brick wall, the farther away from wall surface, the temperature difference between the two solar greenhouses decreases gradually, but the solar greenhouse temperature of block composite wall is always higher than that of brick wall. And over time, the temperature difference between the two solar greenhouses increases gradually, by six o'clock in the night, the temperature of brick wall is lower than that of indoor, there is no heat dissipation; the temperature of block composite wall is still higher than that of indoor,continue to dissipate heat.The simulation results show that the roof and ridge height are the parts with more heat loss. 【Conclusion】 This numerical simulation, comparing the temperature distribution and changing trend of two kinds of greenhouse walls, shows that the thermal performance of the block composite wall solar greenhouse is obviously better than that of the brick wall solar greenhouse, which is the same as the actual cultivation test results, this research provides scientific and reasonable method and basis for the design, construction and maintenance of solar greenhouse wall.