Abstract: To provide software foundation for predicting flight delay,a flight delay propagation analyzing and predicting system was designed and implemented based on SOA. In server side, algorithm of flight delay propagation analyzing and predicting was encapsulated in a Web service, and a graphic component package was offered to automatically generate simulation graphs of flight delay propagation DAG, advanced Petri net, Bayesian network, parallel cellular automata, and statistical graphs such as a bar graph. I}he client side was implemented by Magix AJAX framework. XML is used as dato exchange media among modules to gain good interoperability. The system can be used to accomplish flight delay propagation analyzing and predicting for single flight plan,multiple flight plans,airports and airlines. It shows that the system can effectively aid flight delay propagation analyzing and predicting.

Key words: Flight delay propagation analyzing, Predicting, Web service,Graphic component package, Magix AJAX framework