The locating scriber and auxiliary positioning device of crimping angle was developed and applied in order to ensure the accuracy of crimping angle of strained drainage tube in transmission line. This paper introduced the he components and the working principle of locating scriber and auxiliary positioning device. The results of engineering application show that the development of locating scriber and auxiliary positioning device can produce good economic and social benefits. This paper suggested that angle line procedure should be increased in the strained tube processing for the convenient construction.