Abstract: Considering the shape and the crack characteristics of the high pressure turbine blade，especially the influence of the crack in special parts and the shape of blade to the eddy current field coupling, a new method of eddy current array in-situ detection technology was put forward. Special eddy current array probe was designed for assuring the dependability of eddy current in-situ detection, and especial fixture was made according to the location relation of inspect-hole and blade. The task of the in-situ detection of high pressure turbine blade was well done.