中文摘要：

2013年后,中国的P2P网络借贷（简称P2P网贷）异军突起,在激活金融要素和拓展投融资渠道的同时,也面临着不少理论与实践问题。本文将群组制度视为重要的社会资本,并以此为理论视角,对世界上规模最大的P2P网贷平台Prosper.com1超过12.6万个借款标的进行实证检验,得出的主要结论是：加入群组,特别是加入借款标的经过群组组长审阅和信誉评分较高的群组,不仅能提高借款人获得贷款的成功率,而且能降低借款人的借款利率。本文认为,Prosper.com的群组制度能够为中国P2P网贷平台健康发展提供有益的启示与借鉴。

英文摘要：

In recent years,P2 Plending networks have flourished in the midst of China＇s expanding financial sector.The financial activation and expansion of newer investment channels are also facing many theoretical and practical issues.This paper studies P2 PLending Network Group Systems from a social capital perspective by using the world＇s largest P2 Plending network,Prosper.com.By performing an empirical examination on more than 126 000 borrowers,this paper concludes that joining P2 Plending groups,in particular,joining leading and higher credit score groups,can not only improve the success rate of obtaining loans,but also reduce the interest rate of those loans.This paper argues that the Prosper.com P2 P lending system serves as a worthy reference for Chinese P2 Plending systems.Establishing and perfecting P2 Plending network group systems is one way to successfully develop China＇s P2 Plending networks.