For the calculation difficulty directly of the circular error probability test, a truncated sequential probability circle test method was proposed. Taking the target point as the center, two concentric circles were drawn, in which the area within the small circle was the acceptance domain, the area outside the big circle was the rejection domain, and the middle area was the continuing test domain. On this basis, the basic decision rules in sequential testing were defined, and a calculation model for the risk of both parties and the average number of experiments was provided. Two different decision threshold optimization calculation models were proposed, and the acceptance and rejection domain radii were determined by solving the optimization problem. The various parameters in the inspection scheme under two different decision threshold calculation methods were analyzed using numerical simulation. Among them, the calculation model with the minimum average number of experiments as the optimization objective has better engineering practicality.