Abstract: An experiment to study the effects of organic manure-BGA on soil water movement, distribution in solar greenhouse in Daxing Water Saving Demonstration site of Beijing was conducted. And the results show that BGA is good to maintain the soil water, the soil water content increased by more than 14.5%～28.5% by using BGA. The soil water content is higher at the depth of 20～60 cm, where the melon roots are densely distributed in the same layer. When the dosage to every plant of BGA is 150 g, the soil water content accelerates sharply. As a new type of organic manure, BGA is helpful to save the water resource.