Abstract: Since it's difficult to detect the defect of the big rotor blade visually,especially the exact position and size. Through UT and Shearography's combination,the relative thick glass fiber laminate and bonding area used UT,and for the sandwich structure used Shearography. Through the different devices' combination we can get the detection for the whole blade,further we can do the test for the rotor blade in operation at the wind farm that to guarantee the wind turbine's good operation.

Key words: NDT, ultrasonic, shearography, defect, rotor blade