The present invention provides a business process performance evaluation and decision analysis system which comprises a system management module, a workflow platform, a data extraction and conversion module, a performance evaluation module, a decision analysis module. The system management module comprises an organizational structure management module, a role management module, a user management module, and an authority management module. The workflow platform comprises a graphical process design module, a workflow engine module, an abnormal process processing module processes and a process log module. The data extraction and conversion module comprises a data adapter, a data reporting module, a data conversion module and a multidimensional database. The decision analysis module comprises project analysis, material management analysis, human resources analysis, financial analysis, and other business analysis. According to the system, the multi-dimensional performance assessment can be carried out, and the comprehensive, scientific and efficient decision analysis of various business processes is achieved.