Aleatory contract is a risk agreement between parties which contains uncertain payment .
射幸合同是当事人之间签订的、包含不确定给付内容的风险性协议。
Aleatory as the main feature , it has obvious difference from jitsusada contracts .
它以射幸性为主要特征，与实定合同有显著区别。
After comparison with conditional contracts and unilateral promises , in the second part , the author aims to find the essential difference of aleatory contract from other contracts and summarize its features .
This article analyses the cause of morale hazard in insurance activities , it points out that information game playing , aleatory , lack of traditional values and the deputy system are the causes and enlargement of chinese insurance market 's morale hazard .
