| With economic environment adjustment such as economic globalization, industry boundary fuzziness, and so on, the business environment faced by the enterprises is featured by dynamics and complexity, which renders the competition pattern and competitive subjects among enterprises change tremendously. The competition pattern is no longer a zero-sum game between enterprises, while the competitive subjects also turn out to be a joint unit of enterprises. The traditional strategic environmental analytic frame can not meet the needs of reality anymore, thereby promoting the production of a new strategic theory "Business ecosystem". On the basis of former researches, "Business ecosystem" can basically include its definition, its operations, and its applications. However, There are not many authoritative studies concerning its definition and its operations, thus can not provide solid theoretical foundation for applied research. The present study is consist of the operations of "Business ecosystem", try to reveal how enterprises improve the system health by themselves behaviors and make it become a weapon involved in market competition.With economic environment adjustment such as economic globalization, industry boundary fuzziness, and so on, the business environment faced by the enterprises is featured by dynamics and complexity, which renders the competition pattern and competitive subjects among enterprises change tremendously. The competition pattern is no longer a zero-sum game between enterprises, while the competitive subjects also turn out to be a joint unit of enterprises. The traditional strategic environmental analytic frame can not meet the needs of reality anymore, thereby promoting the production of a new strategic theory "Business ecosystem". On the basis of former researches, "Business ecosystem" can basically include its definition, its operations, and its applications. However, There are not many authoritative studies concerning its definition and its operations, thus can not provide solid theoretical foundation for applied research. The present study is consist of the operations of "Business ecosystem", try to reveal how enterprises improve the system health by themselves behaviors and make it become a weapon involved in market competition.In business ecosystem, the content of enterprise's social responsibility do not differ from that of traditional indivisual enterprise, but the former covers more fields. According to the above result, the enterprise's social responsibility model in business ecosystem is established. The model include three levels:node level(the level of the enterprise himself), co-evolution level and public environment level, with each level involved with certain objects who keystone enterprise should bear the enterprise social responsibility to them. The social responsibility of keystones in each level can include the responsibility that strengthens the enterprise core competence, the responsibility that improves the efficiency of the node, and responsibity that optimatizes the public environment. Those three kinds of first-class index responsibility performance can affect the health of commercial ecosystem. Therefore, the present paper will build the model that indicates the influence of keystone enterprise social responsibility on system health, and carry out a mathematical demonstration of it.The strategy that the keystones assume the social responsibility is not the best idea based on short term. But considering the fact that the backbones and the participants of the system can collaborate with each other in the long run, it becomes a necessity to establish a correspond guarantee system in order to make sure that the keystones can assume the enterprise social responsibility. Regarding the establishment of the guarantee system, the paper puts forwards several suggestions. |