In the domestic air transportation passenger personal injury liability system, the carrier’s attributing principle mainly follows two directions, one is the strict liability system, and the other is the two-tie liability sys? tem of international air transportation. Through the analysis of the nature of air transportation activities, the prin? ciple of carrier imputation has a realistic basis for adopting a strict liability system. The risk source theory, risk control theory, and risk-return coexistence theory provide a theoretical basis for the carrier to use the strict liabili? ty system. Compared with the two-tie liability system, the strict liability system can effectively prevent the oc? currence of passenger casualties; better protect the legitimate rights and interests of passengers and save the liti? gation costs of both parties, which is more in line with the legislative purpose of the legislators of the Civil Avia? tion Law. Using the strict liability system can effectively maintain legal stability and authority. In the domestic air transportation passenger personal injury liability system, the carrier’s attributing principle should follow the strict liability system instead of using the two-tie liability system.