A method to deal with transmission error （TE） and realization in a measurement system on assembly line is introduced

which is designed for transmission chain of final drive in vehicle. In this system

three angle displacement signals which are obtained from driving gear

left and right axle shaft via precise rotary encoder

are processed synchronously with CPLD device. By means of interpolation

angle displacement functions are approximately recovered from discrete signal data. And finally

the purpose of TE precise measurement becomes available from operating these functions on the principle of transmission relationship .