Objective： To explore the relationship between the parameter of P1 wave elicited by pattern stimuli， spatial frequency and visual acuity in traumatic optic neuropathy. Methods：Forty-two cases of traumatic optic neuropathy were enrolled from West China Hospital， Sichuan University. The reversal pattern grating of five check size（117， 58， 29， 14， 7 min of arc） were used as stimuli. The reversal rate of the stimuli was 2.9 Hz， and the contrast level was 100%. The latency and amplitude of P1 wave were recorded while the threshold stimulus was given. SPSS statistical software was used to describe the datum and analyze the relationship between the spatial frequency and visual acuity. Results： There were high correlation between spatial frequency of stimulate threshold and visual acuity， and between the latency of P1 wave and the visual acuity in all the checked eyes. Conclusion： PRVEPs can be used to evaluate the visual acuity.