Abstract: Because of the commercial liability subject’s position and feature,there are some many differences between civil liability and commercial liability.Compared with the civil liability subject,the commercial liability subject must bear the more serious responsibility,which is determined by the special social activity——commercial liability business.In the modern society,in order to protect the weak one’s profits.commercial liability responsibility is tending toward the "social law" So,this changed the idea and system designing of traditional commercial liability responsibility.