As fullautomatic test line change scheme has a great impact on the inspection of the SMT rear section of mobile motherboard. According to the capacity and the number of fixtures, combined with advanced machine vision algorithm and motion control algorithm, the whole line docking scheme of the automatic test was designed on the basis of meeting the planned capacity. The experimental results show that the design of the line change scheme is reasonable, the overall operation of the equipment is good. The technical problem of low line change efficiency is solved, and the scheme has important engineering application value.