With the gradual development of Web services technology, more and more web services has been published on the Internet. However, a single web service just provides limited functionality, and cannot meet the needs of user or business practice. Therefore, Web service composition is becoming increasingly important. This paper introduces web services composition and knowledge of WS-BPEL, by using the latest business process execution language WS-BPEL to describe business process, by using business process, a loan approval application case is designed and realized in J2EE integrated development environment, by using the web service executive engine Active BPEL to deploy, the web services are combined effectively.