Abstract: The wind farms built in the pressure-covered mine exist great security risks，which are affected by the underground mining.The security protection technology system of fans with the integration of avoidance，resistance，monitoring and repairing，is proposed typically，according to the analysis of mining and deformation characteristics of the fan which is the main structure in wind farms.Combining the conditions of surface and underground，the principle of priority selection for fans is proposed，and the anti deformation construction technique measures for fans are put forwards.Mainly aiming at the lean of fans，the mining deformation observation for fans is designed.The basic rectification and repair measures that are suitable for fans are proposed，in view of safety risk that fans might lean too much affected by mining.The research will actualize the long term safe operation of wind farms built on the mining influence area without protective coal pillar.It starts an effective technical way for building wind farms in the pressure mine，with high application value.

Key words: Fan, Mining influence, Wind farm engineering, Safety, Protection technology