In view of the lack of effective data discrimination and validation mechanism in the coordination operation mode of smart grid power scheduling， a data validation rule library for power scheduling is put forward. Moreover， based on this rule library， the data validation system is developed on the unified support platform of the smart grid dispatching support system（SGDSS）. The composition of the rule library， the system architecture and the realization of functional modules are elaborated. The data validation application is a success in East China demonstration project of SGDSS.