Abstract:In view of the seismic signal being non-stationary signal,the paper discussed the methods of joint time-frequency distribution in analysis of non-stationary signal theory and its time-frequency attributes.Generalized into local frequency from integralfrequency,the method of joint time-frequency distribution effectively analyzes the signal based on the variation of frequency with time.The attributes(average frequency, instantaneous bandwidth,twist and peak level)obtained from joint time-frequency distribution can break out the limitation of traditional instantaneous attributes,effectively point out the variation in geologic formation and be applied in seismic data interpretation as a good attributtes.