Abstract: Due to the influence of goaf masses， it is difficult to mining remnant ore in the safe and effective method. According to the actual situation of Chaobuleng iron and zinc polymetallic ore ， the technologies of goaf precision detection and model reconstruction were used to build the composite 3D model of ore and goaf masses， and the model consistent with the actual situation. Based on the Detailed 3D model built by the coupling technology of 3Dmine、Midas/GTS and Flac3D， the result of numerical calculation shows that the goaf masses is mainly stability， but the collapse disasters are likely to happen in the tension zone， and 1# shaft is faced the threaten of Ground Settlement. From the analysis of the stability and rock mechanics characteristics of goaf masses， the exploitation system and transit system are reconstruction， and get the remnant ore stoping scheme，which can provide the guarantee to mining the remnant ore.