Abstract: Quality is the basis for the survival of enterprises. With the people's living standard improving and consumption level promoting, the common goods cannot meet requirements of consumers. In the case of "Congenital deficiencies, the acquired development deformed ",China's dairy industry should spare no efforts to improving product quality and conducting quality control immediately to achieve better and faster development. Numerous studies focus on the causes and solutions of the dairy products quality security problems at home and abroad. But there is a lack of research on quality control based on the perspective of whole industry chain. Besides, it is urgent to deepen the research on the quality value of dairy quality. Most of researches have been analyzed in the angle of qualitative one, lacking the quantitative analysis of in the value flowing relationships and value increment among various bodies, which can not reveal intrinsic mechanism of the value formation, flowing and increment.Dairy Quality Control, a systematic engineering covering multi-link and multi-body, is difficult to implement for dramatic quality sensibility, complex multi-agent behaviors and interests. By analyzing the relationship of the dairy industry chain bodies, a quality control GERT network model based on the quality value flow is constructed and it proposes a quality control pattern dominated by the core enterprise. Then the computing result of parameters are compared in three hypothetical scenarios including the chain bodies unwilling to strengthen quality control, each body strengthening quality control independently and the core enterprise leading quality control in the whole industry network. It highlights the importance and necessity of the core enterprise leading in the model. Finally, it will find the key resources of quality control based on GERT Network model and provide the reference to the development of China's dairy industry.
Studies have shown that the quality control in whole industry chain has obvious advantages under the dominance of core enterprises; To intensify the quality control in dairy products industry, steps should be taken from different aspects, especially the evident dominant status of core enterprises in this process. While the establishment of quality control systems under whole industry chain should be focused on the distribution of resources and allocation of interest. The efficiency of resources distribution has immediate relations with business competence, and the model of resources allocation has an effect in main party's enthusiasm. Therefore, the core enterprises should regard the balance of resources in quality control as initial point of working, they guarantee the increase of quality values in all industry chain through reasonable and ordered investment in capitals, technology, human resources, logistics restore and related experiences.

Key words: dairy, industry chain, quality control, GERT, quality value