In automatic processing of seismic records, based on the method of autoregressive Akaike information criteria(AIC) and the amplitude ratio between signal and noise, a hybrid method for estimating arrival time of seismic phase is presented in this paper. Using the curve of AIC and the curve of amplitude ratio a new curve is constracted, which is transformed by a similarly rotation of coordinate.The new curve can accurately estimates arrival time of signal in automatic processing, especially for later phases(such as S-wave, Lg-wave) with low ratio of signal and noise. The arrival times for 23 seismic P-phases and later phases recorded at WMQ station in CDSN are picked by the new method. In comparison of manual result, the root mean square error of P-phase is 0.71 second, and one of later phase is 1.64 second, which is better than the result obtained by traditional AIC algorithm.