The impact of emergency reserve and generator governor rate to frequency characteristics is analyzed. And the risk of over cutting caused by wind uncertainty and alternate action between UFLS and fans high-frequency protection is discovered. A tuning method for high-frequency protection program of fans is proposed. The method considers the impact of emergency reserve and frequency characteristics of emergency control in isolated grid, to set the minimum value of the fans’ high-frequency protection. Referencing rounds and quantitative low frequency load shedding, the high-frequency protection value of wind turbine is set by wheel through the continuous iteration of each round of expected faults. An actual power grid case is analyzed, with which coordination between emergency control and wind turbines' protection is realized, the shortcomings of over cutting caused by wind uncertainty and the possibility of alternate action between UFLS and fans high-frequency protection in existing high-frequency protection program of fans are solved, and high-frequency protection program of fans is optimized. This work is supported by Science and Technology Project of State Grid Corporation of China "Frequency Modulation Characteristics Analysis and Optimal Control Technique Research of Sending-terminal Power Grid of Large Renewable Energy Base".