Aiming at the problem of circle arc drawing in work piece size measurement system, a 3 points sequential circle arc drawing algorithm is designed by combining with Bresenham circle generation algorithm. This paper introduces the generation and selection of candidate points. The termination condition and coordinate transformation are expounded. The methods of the design are compared with digital differential analyzer (DDA) algorithm and direct coordinate generation method. The experimental results show that compared with DDA algorithm, direct coordinate generation method and some literature methods, the algorithm has better visual effect and higher time efficiency, and achieves the purpose of engineering application.