Rational social mobility is an important mechanism to propel social harmony. The standard for the rationality is the principle of equal chances.

合理的社会流动是推进社会和谐的重要机制，而机会平等原则是衡量社会流动是否合理的根本标准。

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Delivery of commodity housing should be title certificate according to legal principle theory. Standard of delivery can improve with the development of social in an orderly way.

而从法理上分析，商品房交付条件应是有产权证，同时交付标准具有不断提高的驱动力，提高交付条件可以通过循序渐进的方式逐步实现。

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