BH_GRAPH, developed by the Virtual Reality Laboratory of Beihang University, is a high-performance real time 3D graphics platform for simulation system developers. Not only does this platform support extendable software architecture and standard scene management mechanism, but also it provides high efficient scene rendering method and convenient application programming interfaces. BH_GRAPH can greatly accelerate the development of 3D graphics application system and provide comprehensive technique supports for its efficient running. BH_GRAPH is composed of three core components: 3D graphics rendering engine, 3D object model modeling tool and 3D scenes editor. Current dominant techniques about rendering and modeling are involved and implemented in this platform, including real time shadow, high dynamic range material, large-scale terrain rendering and management, GPU based particle system, swingable tree and the real time rendering of tens of millions of surfaces. An overview of BH_GRAPH is given and then the architecture, main functions and relating key techniques of the three component tools are introduced in detail.