The basic legal characteristic of this contract has been analyzed, the summary to the kind of the aleatory contract has been carried on subsequently.(隨后對射幸合同的基本法律特征進行了分析，最后對射幸合同的種類進行了概述。)

As the electrochemical rectifier transformer CAD system aleatory and enormous, it is divided into two parts.(由于電化學用整流變壓器CAD系統較為復雜龐大，分兩個部分進行研究開發。)

The first part talks about theoretical issues, including definition of aleatory contract based on study of historical cases, analysis of legislation and scholars'opinions;(緒論部分綜述了射幸合同的研究現狀，并通過案例分析引出該研究的必要性。)

Aleatory as the main feature, it has obvious difference from jitsusada contracts.(它以射幸性為主要特征，與實定合同有顯著區別。)

The general standards to judge the legitimation of aleatory contract are as follows : if the contract damages the interests of one party, interests of others, or public interests ;(判斷射幸合同合法性的一般標準是：射幸合同是否嚴重損害當事人一方利益、他人利益或社會公共利益；)

The aleatory contract is a special contract taking uncertain item as the contract object. It's contingent, so people generally regard it as the improper one.(射幸合同是以不確定性事項為合同標的的特殊合同，它帶有很大的機會性和偶然性，所以人們一般視其為不正當的。)