The bankruptcy of financial institutions has a great systematic externality,which is a serious threat to financial stability and security.The government's financial supervision should focus on reducing the moral hazard of financial institutions to avoid the threat of financial security.Based on the extension of the stylized model,we discuss the relationship between the moral hazard of banks and the size of the bank,the structure of bank liabilities,and the government's rescue model.Conclusion:the concentration and bank moral hazard positive correlation between banking financial institutions, according to the safety of capital adequacy requirements can inhibit the level of moral risk of financial institutions,but compared with the dominant mode of tacit rescue rescue mode spawned more moral hazard. The comparative analysis shows that the explicit financial rescue model is more efficient than the recessive one.

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