Modern visualization technology is an important option to improve the intelligence of power system operation. Based on scalable vector graphics（SVG） technology， a unified， compatible， integrated power system visualization platform and standard visualization methods library are developed. The platform can support various visualization technologies including SVG with better compatibility and integration of different types of visualization tools. A visualization methods library based on SVG and geographic information is developed， which automatically matches the actual power grid model and data format. The methods library is flexible， portable and efficient with a standard object-oriented interface. Moreover， integration is realized of intelligent human-computer interaction in the visualization platform and the method library， implementing technologies of similar information integration， data mining， machine learning and forecasting. The intelligent human-computer interaction is beneficial to improving the perceptive and analytic ability of system operators towards power system operation.