Abstract: In order to provide scientific basis for the prevention of heat harm problem in deep mine, the characteristics and major factors affected to temperature fie Ids were analyzed.The interaction mechanism between the flow field and temperature field of deep coal and rock mass was studied. The rock thermo physical properties and the control action of temperature fields on the fracture network geometry parameters were numerical simulated. The results showed that geothermal gradient was hi gher in the strata with lower thermal conductivity.The fissure water temperature would be greater with the convective heat transfer coefficients increased.The convective heat transfer coefficients would have no significant effects on the water temperature when it was greater than 500 W/ (m2.K) .The deep rock mass seepage field would have lttle effects on the temperature field when the permeability was far lower than 10-14 m2 or the facture width was far lower than 0.000 1 m.