This paper deals with the first arrival batch modification methods which use the common-offset first arrival curve combined with the common-source-location basis by setting different parameters aiming at overestimation and underestimation of first arrivals. It also presents a new approach to the automatic picking of the later phase of the first arrival rather than the first break using a trough-to-peak ratio technique combined with expected arrival time, picking window and threshold. The application of these new methods remarkably improves the precision and efficiency of the first arrivals picking in areas of poor signal-to-noise ratios.