Abstract: In order to study the influence of different fan blade angles on the performance of coal mine ventilator，the physical model of fan is established，and the structure of fan blade is designed. The orthogo‐ nal test method and finite element analysis method are used to study the FBD No.8.0 coal mine fan used in Jinxinda Coal Industry. The fluid simulation software Fluent is used to build the fan model，and the influ‐ ence of blade angle on the performance of fan is numerically simulated. The simulation results show that there is eddy current structure in the internal flow field of the fan，the internal energy loss of the blade is small，and the total entropy output value of the wing angle structure bladeis reduced by 2.15%. When the relative installation angle of the first stage blade of the fan is 75%，the maximum pressure of the wing angle blade increases by 21.19%.When the relative installation angle of the secondary blade is 25%，50% and 75%，the pressure is increased by 2.5%，9.6% and 8.4% compared with the prototype blade.It can be seen that by adjusting the blade installation angle，the fan pressure can be increased and the air volume per unit time of the fan can be increased，so as to achieve better ventilation effect.

Key words: coal mine, FBD No.8.0 type fan, Fluent software, blade angle, fan performance