Abstract: Using lumped parameter technique, a passive solar greenhouse with hot water system to adjust the warm performance was regarded as the plate collector.Using the similar test method to determine the thermal performance of domestic solar heaters, the greenhouse heat balance and heat loss and average heat transfer coefficient had analyzed. In view of a greenhouse, the average heat transfer coefficient was tested and calculated. The results showed that the glass greenhouse, covering an area of 45.09 m2 ground for reinforced concrete roof, without soil and crop, the average heat transfer coefficient was 5.3 W/(m2?℃). It has a reference and the practical value to the greenhouse thermal properties analysis.