Obtaining the stability level of rock mass is of great significance to the deep mining of ore body, surrounding rock support and gob filling. Based on the engineering geological conditions of Zhong Guan Iron Mine, the BQ value of rock mass at the measuring point is calculated through laboratory rock mechanics basic property test, field rock mechanics test, field rock joint investigation and in-situ stress test, etc. By using the data processing and spatial analysis function of ArcGIS software, the spatial distribution pre-diction model of rock mass quality in the study area is established through Kriging interpolation technology, and the rock mass quality of -230m horizontal ore body is predicted and analyzed by using this model. Combined with the field measurement, the verification analysis shows that the predicted results are in good agreement with the actual situation, and the quality of -230m horizontal ore body in Zhong Guan Iron Mine is poor, easy to be broken and unstable. The spatial distribution prediction model of rock mass quality obtained provides a method for studying the stability level of rock mass in the case of incomplete disclosure of rock mass engineering, and provides a theoretical basis for the subsequent safe mining of Zhong Guan Iron Mine.