The interface and function of the meteorological code data automatic transformation processing software is introduced in this article that is used in the weather forecast. The design methods are illustrated in detail about the time controlling, the code merging, the control on the sub-process for code selection, the inquiry of the result of the processed meteorological codes, and the method of the data storage management, etc. The examination shows that the software is stable when in use and it meets the needs in the routine forecast operation in the meteorological stations.