To improve the accuracy of curved pipes measurement, a point cloud fusing-based measurement method was proposed. The principle of machine vision was utilized to extract coordinate of the marked points from images taken from cameras, and the marked points were used as fixed points in the process of 3D scanning to obtain the uniform point cloud. Point cloud fusion technology was used to obtain the 3D digital model of curved pipes. Experimental results showed that the maximum absolute deviation between measured values and standard value was 0.16mm. This method can effectively improve the accuracy of curved pipes measurement.