In order to improve the quality and efficiency of weather services in civil aviation,a warning system for aviation weather is proposed, in which through a series of warning levels for airport weather,users can retrieve the meteorological database periodically to get Aviation Weather Reports, calculate the weather alert levels for airports in China, and translate Aviation Weather Reports into plain language. Technologies, such as JSON (JavaScript Object Notation) and AJAX (Asynchronous Javascript And XML), are applied to send the analytical results to the browsers, which load map and display the weather alert levels of each airport through the BaiduMap API. This system achieved the function of allowing user through the PC and mobile devices to obtain the realtime display of the airport weather of the whole country, weather warnings and related data. The application indicates that the system has good reference value for the enhancement in application of API for maps in the aviation weather field, enriches and improves the way and efficiency of civil aviation meteorological services, being of broad prospects.