Abstract: Discriminating water source of water inrush in coal mine is the first step to control water inrush.Analyzing mine inrush water quality by fuzzy comprehensive evaluation method,the sources of water inrush can be accurately discriminated.Combining with the example of discriminating water source of water inrush in one mine,the discrimination of mixed water sources of the mine water inrush and the exclusion of taking Ordovician limestone water as possible water sources are specifically addressed.Then the actual exploration holes and different aquifers water level monitoring of water inrush points region are applied to check the result,which proves the reliability of evaluation method in discriminating water inrush source.