The speech recognition software Spark SDK, which can be developed again, is designed by Lernout and Hauspie company. And it is designed to provide a fast and easy way for the developers to add voice command recognition function into their application program. This paper introduces the method of realizing connected digit recognition by editing the function of professional words recognition and modifying the grammar rules of Spark SDK in radar intelligence oral-reporting system. The result shows that the recognition ratio is greatly improved.