Abstract: Aiming at the problem that it is impossible to effectively registration PCB CT images that contain many similar regions,an algorithm is proposed based on point-pair match.We first generate the point-pairs from adjacent points and describe them using the simplified method of a fast low-dimensional descriptor called KPB-SIFT,then reduce mismatches by means of the prescriptive point-to-point directions and classification match.Finally a mismatch resistant algorithm is developed to pick up the correct match points based on an error constraint of matched point direction.Experimental results show that the algorithm maintains a low time complexity and keeps a high correct match ratio of 95.58%.It can effectively solve the registration problem of PCB CT image by extracting correct matches which are uniformly distributed.