Abstract: In order to preliminarily understand the in-situ stress state in Maoping lead-zinc mine，the methods such as geological structure acting and Kaiser effect of acoustic emission were used to analyze the principal stress of mine.On that basis，the level of in-situ stress was judged.The research results showed that the maximum principal stress direction of Maoping lead-zinc mine ranged from N60° to 70°W and from N45° to 50°W，and the value of the maximum principal stress is about 12.14 MPa.Taking the stress ratio of rock strength as the criteria of judgment，it is considered that the in-situ stress of Maoping lead-zinc mine exist a development trend from low ground stress to high ground stress.

Key words: Maximum principal stress, In-situ stress level, Acoustic emission, Kaiser effect