As reforming development and innovation of China's economic system , our country's insurance also presents the high-speed development of the situation, however, the high speed of development also hidden behind with many problems. Insurance market is typical informational asymmetry, resulting in the wide existence of adverse selection and moral hazard. Thesre problems hinder our country insurance industry in a large extent. Solving the development of asymmetric information, controlling the adverse selection and moral hazard, so as to promote the healthy and orderly development of the insurance industry are especially critical. The relationship of Insurance company and policy-holder is a principal-agent relationship, and it is thought that policy-holder is agent, and the insurance company is the principal. Consequently, according to the principle of the principal-agent theory and the actual situation of the insurance market, the design of principal-agent theory analysis of the insurance contract is benefit for improving the development of the insurance paper expounds the asymmetric information situation of insurance market . With the insurance market for research object which is mainly in the insurance market information asymmetry. On the condition that the existing and non existing of the moral risk between policy-holder and insurance company, based on the principal-agent theory to establish relevant model and study how to make a optimization of the insurance contract and how to avoid the risks.