The main purpose of the software development is to solve the problems of practical computation and interfaces. It mainly introduces how to compile computing general program in the environment of Visual C++6.0. Adopt MFC program interface design and use ADO to connect SQL database. Meanwhile, take GB 300MW condensing unit thermoelectric generators unit integrated coal consumption computational analysis as an example, The system has several major functions such as parameter setting, comprehensive performance calculation, single parameter impact analysis, heat deviation analysis, data query and so on. The Visualization of user interface has been implemented, the precision of calculation has been improved, and the computational effort has been greatly reduced. At the same time, it provides technical support for the power plants unit in respect of safe and efficient operation and improvement of energy efficiency.