Taking the inner thermal insulation greenhouse as research object，this paper installed 28 water pipes（diameter 0.1 m，length 3 m，spacing 0.4 m）in the back wall（37 walls）of solar greenhouse，with 0.66 m3 total volume；and studied the effect of heat-accumulated water pipe on thermal environment of solar greenhouse. The results showed that after installation，on a sunny day，the lowest temperature in greenhouse was increased by 2.3 ℃ ；on a cloudy day，the lowest temperature in greenhouse was increased by 0.6 ℃ . The lowest temperatures at 0 cm and 20 cm inside wall of solar greenhouse were higher than that of the contrast area.The thermal insulation properties of the wall were obviously enhanced. In January，the maximum temperature，minimum temperature and average temperature of the test area were 5.22，0.71 ℃ and 1.36 ℃ higher than that of the contrast area. Under continuous（3 days）adverse weather conditions，the daily soil（20 cm）minimum temperature of solar greenhouse was increased by 2.6-3.1 ℃ ；and under continuous sunny condition（3 days）the daily soil（20 cm）minimum temperature of solar greenhouse was increased by 2.0-3.7 ℃ . Visibly，installation of heat-accumulated water pipe could significantly improve the thermal environment in greenhouse，thus the solar energy efficiency of heat utilization in greenhouse was raised.