The article which discusses the problem,insightingly from the economic point of view,analyses the strict liability and the negligence liability respectively,and probes into the efficiency and fairness in the principle of imputation of environment tort,tries to rethink the principle of imputatio.

In the west, most countries and districts adopt joint and several liability for CPA s negligence liability.

The dispute of principle for it mostly concerns the choice of strict liability and negligent liability.

The ancient Roman tort decided the main conditions of the Roman torts, promoted the civilization of liability mode of torts, established the liability for negligence for the first time and laid a foundation for the liability principle of the modern torts law in the continental legal system.

As a separate liability,liability for negligence in contracting is for protecting trust benefit in concluding a treaty,it s theory bases are the principle of faithfulness,credit and the principle of equity.

Scholars have different opinions on the application of liability without fault.

Applying no-fault liability to medical injury compensation and adopting the liability insurance system, can mitigate the conflict between the hospital and patients, and is beneficial to both sides.

This thesis thinks that no-fault liability can be divided into the absolute no-fault liability and the relative no-fault liability.