Abstract: The design of the solar lean-to greenhouse with out wall is aimed at solving the problem of poor light intensity of the solar lean-to greenhouse in main production season, such as in spring, summer and winter in northern cold areas. The light intensity and the cost of construction were investigated. The results showed that the cost of the solar lean-to greenhouse without wall was higher than the solar lean-to greenhouse with soil wall and lower than the greenhouse with brick wall. The light intensity(condition) of the solar lean-to greenhouse without wall was superior to the solar lean-to greenhouse in May, June and in July weather in clear or in cloudy day, and the photo effect was more outstanding especially in north of the greenhouse. A good light condition could provide high yield and superior quality for greenhouse production trait.