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Objective:Measuring the endplate gradient on C3~ C7 of native human beings and discussing its influence on cervical surgery in order to improve the progress of cervical surgery science.Methods:160 lateral X~ray films of cervical spine of the persons with age from 21 to 60 years old,were scanned into computcr and the endplate gradient of C3 ~ C7 were measured with the program of SigmaScan Pro 5.The difference among both groups and vertebral bodies were compared.