Gas meters are widely used and need to be regularly and compulsorily replaced, and the first inspection items are complicated and workload is large, and the existing gas meter metering inspection line has low efficiency and no synergy in discrete testing. In this paper, we study the first inspection scheduling technology based on the gas meter metering inspection line, starting from the composition of the gas meter metering inspection line and the requirements of the first inspection items, and investigate the gas meter inspection scheduling modeling based on flexible job-shop scheduling problem, discrete particle swarm optimization based scheduling solution method to find the optimal task scheduling sequence. The experimental results of scheduling optimization for a batch of gas meters to be inspected show that the scheduling technique in this paper can reduce the total testing time by 33.3% and improve the inspection efficiency and equipment utilization.