As we well know that, it is meaningful if we obtain the exact altitude of the melting layer, its depth and much more other information about cloud, and we could utilize them in retrieving cloud microphysics, weather modification, cloud parameterization of numerical modeling and its evaluation. In order to acquaint the definite location of the metling layer in a cloud, in this paper, first of all we have analyzed 456 cases observed at Guangdong, Hebei and Jilin by our could radar during recent three years, and there are 34 cases in which appear notable metling features. Secondly we take account of the macroscopic parameters’ characteristics, such as the depth of melting layer, the variation of the radar reflectivity at the melting layer. And then one method is proposed which makes use of the vertical profile of radar reflectivity and linear depolarization ratio to identify the altitude and depth of the melting layer. Afterwards, we select and use the rawinsonde data at the same time for the same case to make comparative experiments, which show that the results of the two kinds of data are very closer， the result by inversion method is nearly below the 0° line of the rawinsonde data, and the linear depolarization ratio indicates more sensitive than the radar reflectivity to the melting layer.