This thesis proposes a novel model for mapping BPEL into PADRES's subscription language, thereby decentralizing business process execution in PADRES. Algorithms about the implementation of BPEL activity agents are provided. A Web services interface is designed as well to bind to PADRES in order to support Web services. Experimental results show that the proposed model can increase the throughput of execution approximately 42% under normal system loads and over 200% under high system loads.The business process execution language for Web service (BPEL) is a standard specification which specifies the interaction protocols between business processes. The current runtime BPEL engine is centralized to orchestrate the process interaction.The content-based publish/subscribe system provides an efficient and flexible means for information consumers and information producers to exchange data. PADRES is such an integral content-based publish/subscribe system. With the support of composite subscription, PADRES is ideal for decentralized execution of business processes.