[摘　要]　将共有产权引入我国保障性住房是一种租售并举制度的重大创新，改变了由单一主体投资购房的局面。在总结共有产权住房按份共有的法律特征和覆盖人群的保障特征的基础上，对其定义和内涵进行了明确的界定，并辨析了份额的概念。通过考察国内外实践做法归纳出4类产权份额计算方式，进而采用逻辑推理找出份额比例与计算方式的关系，比较了各自的优劣。最后在住户使用费的认定和政府产权份额计算原则等方面给出了完善当前政策的建议。

[关键词]　保障性住房,共有产权,份额

Abstract: It is a momentous innovation for mutual property right model being introduced into domestic ensuring housing system, advocating that rent and sale are equally important. The definition and implication of mutual property right of ensuring housing is given based on the sum-up of its legal characteristics and protective characteristics of the ensuring group, and the definition of share is discriminated. By the comparison of the systems in home and abroad, four types of calculation rules of tenancy in common are concluded, and depending on logical reasoning, the relationship between share ratio and calculation mode is found out, and the advantages and disadvantages are compared. Finally, some advices are given for improving China's current policy on the charge identification and the selection of calculation rules.

Key words: ensuring housing; mutual property right; share

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建筑经济，2010（3）：31-34