In the printed circuit board defect inspection based on AOI, there are some dislocate deviation between sample PCB image and the PCB image, which make the need of the image registration to be processed. First of all, define the sample image edge point concept according to the PCB line features, formulate the edge points sampling rules. Then, in the view of the PCB image, propose the registration intensity evaluation based on the sample edge points, and establish of evaluation model and fast algorithm for registration. Finally, through the PCB registration experiment and plenty of application testing, prove that the alignment intensity evaluation model can accurately describe the alignment level for the sample PCB image and the tested PCB image, which can provide reliable migration parameters for the defects search for later period.