Abstract: This article reports the practical investigation and determination of capacity of forest water conservation in Songhuaba protected region,analyses the comprehensive and real capacity of forest water conservation,compares the deducted negative effects with water-regulating indexes and finally,evaluates the beneficial results of water conservation capacity in Songhuaba protected region. The results show that the investigation and determination of Songhuaba water conser-vation capacity provides a theoretical basis for stable supply of water resource for a long time.