In order to make full use of grid real-time data in daily analysis and calculation and simplify the data entry, the online interface software of EMS and PSASP is developed. The software analyzes the data structures of EMS and PSASP in detail, realizes online and offline data integration and makes the history data of Jiangsu grid at any time seamlessly with PSASP. Through checking the results before and after data integration, the data interface is proved accurate and can provide basic data for grid operation mode calculation and failure analysis. In addition, dynamic monitoring and warning of grid operation state based on PSASP is realized by graph mode integration technology.