In order to strengthen the ability to monitor Guangdong meso scale weather phenomena, a meso scale monitoring and predicting system as well as more than 600 AWSs was built in Guangdong Province. How to improve its regular organization efficiency and fully develop its effectiveness, the main issues are to construct and to use the databases very well. The main idea to do this is, based on the CMA′s "9210" program meteorological database, to extend mesoscale AWS′s database, to solve the problem of the relationships between the databases, and to set up a batch of meteorological application systems.