In order to improve the energy saving effect and find out the proper wall materials and its composition of solar greenhouse, the temperature environment inside several greenhouses with the same structure and different wall materials was tested. The heat transfer properties of 600 mm thick wall composed of different materials were studied with the method of frequency response. The results show that the average temperature on the inside surface of the complex wall is 3.7℃ higher than that of brick wall in one solar greenhouse and that the average temperature inside the greenhouse with complex wall is 3.0℃ higher than that with tamper earth wall under the same temperature outside. The results of theoretical analysis indicate that diminishing multiple toward the outside temperature fluctuation of the complex wall is 12.3 times of that of polystyrene foam plastic plate and 9.5 times of that of brick wall, and that the quantity of heat flux toward outside of the complex wall is 1/17 of that of brick wall. Polystyrene foam plastic is better to be thermal insulation material and brick is proper to be thermal storage material. The optimum wall composition was given in this paper.