1. A fingerprint verification method based on global ridgeline, comprising the steps of: 1 searching base point pair between the stored fingerprint template and the fingerprint template to be matched, said base point pair being the positioning reference points for postural calibration between the stored fingerprint template and the fingerprint template to be matched; 2. conducting global ridgeline verification, comprising conducting global verification between ridgeline point of the stored fingerprint template and that of the fingerprint template to be matched, and checking if the two fingerprints match, said ridgeline being composed by ridgeline points, the realization being further done through the following 4 steps of: 2.1 fingerprint template postural calibrating comprising the steps of taking base point pair as the alignment target and calculating the translation value & revolving value, and then aligning the fingerprint template to be matched T 2 to the stored fingerprint template T 1 ; 2.2 obtaining the total number (S 1 ) of ridgeline points of T 2 in overlapping area comprising the steps of aligning the template to be matched T 2 to the stored template T 1 , forming an overlapping area, and calculating the number of ridgeline points of T 2 in the overlapping area and marking the number as S 1 ; 2.3 verifying ridgeline points comprising the steps of checking the number of all the ridgeline points of the template to be matched T 2 in the overlapping area and marking the number as S 2 ; 2.4 calculating the match ratio of the stored fingerprint template and the fingerprint template to be matched, comparing the result with the judgment threshold value T and outputting the verification results.