The current focus of enterprises on automating processes has led to the extensive application of workflow management systems. To integrate traditional workflow management systems with others has previously been difficult; however, rapid development of Web services has solved the communication problems among heterogeneous platforms and allows for the efficient integration of legacy systems. This paper emphasizes the design and implementation of a secure service-oriented workflow platform effectively integrating heterogeneous platforms. Moreover, current system architectures could adopt the developed WSSecurity application framework rapidly and inexpensively.