Abstract: Taking the hydrated inorganic composite phase-change materials （FCPCM），mainly CaCl2，as basis filler in interlayer of back wall of sinking solar greenhouse in Zhengzhou .The variation of indoor temperature，the surface of back wall temperature and outdoor temperature in typical weather conditions between CPCM greenhouse and CK was observed and discussed.The results showed that the average rising rate of CPCM greenhouse was 3.26℃/h uncovering the insulation cloth in sunny days，which was lower than CK(CK is 3.65℃/h).The highest temperature of CPCM greenhouse was slightly lower than CK in the afternoon.The surface temperature of the back wall was 3.9℃ higher than that of CK during daytime，and 1.8℃ higher than that of CK at night .The range of temperature between indoor and outdoor was higher than that of CK The interior temperature and the surface temperature of back wall interlayer and the variation of temperature between indoor and outdoor changed similar in rainy days .The interior temperature and the surface temperature of back wall decreased at the rate of 0.08℃/h in CPCM greenhouse，which was higher than that of CK The range of temperature between indoor and outdoor was little，while it increased gradually in CK Heat could be absorbed and stored by FCPCM effectively to increase the temperature of greenhouse，which was good for growing The results could provide theoric basic for understanding the properties of hydrated salt composite phase change material

Key words: Sinking solar greenhouse, Hydrated salt composite phase change material, The wall of phase change material, Heat preservation of greenhouse, Energy storage bag