The 120G FMCW radar level gauge was successfully applied to the level detection of slaked lime in Inner Mongolia Yitai Coal-to-liquids Co., Ltd. The environment of the storage tanks in the Guihua plant is complex and the smoke and dust are very large. The imported bell mouth radar level gauge used previously , The bell mouth is easy to get dusted for a long time and the measurement is not accurate. After the technical communication of our company, the field test signal of our company’s 120G FMCW radar level meter is better and the test data is accurate.