Based on game thoery , this article reviews the mode of american interest groups " decision - making participation , investigates multi - fuction of various interest groups " game . and then simulates the model of interest group " s political participation model , proving related polycentrism & postpolycentrism interest group thoery in the frame of double game thoery . charpter 2 , 3 , 4 are main contents 本文在博弈论的基础上，考察了美国利益集团参与政治决策的方式，研究了各种利益集团的相互博弈形式，并模拟了利益集团的政治参与的最优化目的模型，在双层博弈的框架内印证了有关的多元主义? ?后多元主义利益集团理论。
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Part three paretively study the law of protection for disadvantages . it stresses particularly on the american , german and sweden into which we probe the experience is social welfare polycentrism , social run oneness , executive rigorism and jurisdiction authoritism . meanwhile , the thesis points out that disadvadvantages must be properly protected in the priniciple of either survive or competition 第三章，弱势群体保护的比较法考察。在对德国、美国和瑞典弱势群体的法律保护进行分析比较的基础上，认为这些国家弱势群体保护的成功经验是实行了社会福利多元化、社会管理统一化、行政执法严格化、司法诉讼权威化。
