Negotiorum gestio system is a long-standing legal system, by the thousands of years of development, in the continental law system countries have established a complete system. The research for negotiorum gestio system in China is less, system is not comprehensive, need to accelerate the pace of legislation theory research. And in the Anglo-American law system is not exactly the same system with negotiorum gestio system, but quasi contract system of Anglo-American law system covers the contents of negotiorum gestio. So on the basis of negotiorum gestio is discussed some theory, and the quasi contract system to do a little more. This article is divided into the following several parts, the first part from the history, concept, nature, value and status in this paper introduces the basic situation of negotiorum gestio. The second part discusses the condition of negotiorum gestio. The third part and the fourth part introduces the quasi contract system of Anglo-American law system and compare it with negotiorum gestio made some. To improve the country's best negotiorum gestio system puts forward some Suggestions.