Most of the urban rail transit enterprises in China have high construction and operation costs, while the government imposes price control on their fares, making their revenues unable to cover their costs and thus causing certain losses. In order to ensure the economic sustainability of urban rail transit enterprises, the government then subsidizes their losses. In the context of loss subsidies as the main subsidy mode for urban rail transit, the government regulates whether urban rail transit enterprises waste cost in order to protect social welfare and reduce the financial pressure of subsidies. This paper constructs an evolutionary game model between government regulators and urban rail transit enterprises, establishes replicated dynamic equations to obtain the evolutionary stabilization strategies of the government and urban rail transit enterprises under different situations, and analyzes the effects of various parameters on the cost control behaviors of urban rail transit enterprises under different loss-subsidy modes through numerical simulations. The theoretical study and simulation results show the following: When only the regulatory policy is adopted, the optimal strategy of urban rail transit enterprises may be cost saving or cost wasting under different subsidy models; if only the penalty policy is adopted, the enterprises will choose the cost wasting strategy when the penalty is small, and the enterprises will choose the cost saving strategy when the penalty is large; if only the fixed proportion subsidy model is adopted, no matter how large the proportion k of government subsidies is, the urban the optimal strategy for rail transit enterprises is cost wasting. If only the regressive loss subsidy model is adopted, the different sizes of its various parameter settings will also lead to the enterprises’ choice of cost wasting strategy or cost saving strategy. Therefore, the government should formulate corresponding policies according to different cost control objectives.

Abstract. As the third largest urban agglomeration in the Yangtze River Delta and the Pearl River Delta, Beijing Tianjin Hebei region is in a very important strategic position in China. In order to ease Beijing non capital function,solve Beijing urban diseases,optimize the core function of the capital and make this region to be a world-class city group with international competitiveness,this paper analyzes the characteristics and advantages of the industrial development in Beijing, Tianjin and Hebei region from three aspects including transportation, regional specialization and labor force, and puts forward the way to the development of Beijing, Tianjin and Hebei Province according to their own characteristics. 1.IntroductionWith the global integration and the further deepening of international division of labor, urban agglomeration has become a regional space unit to participate in the international competition. To form a healthy development of the city group,we should not only construct the infrastructure to protect the city to be more smoothly carried out exchanges and communication flow of personnel, but also pay attention to the coordinated development between the industry in various regions, define their strengths and develop their own industries with comparative advantage.Comparing with the development of Yangtze River Delta and Pearl River Delta region, the development of the Beijing Tianjin Hebei region shows a significant imbalance phenomenon. Beijing, as a fastest growing growth pole in Beijing Tianjin and Hebei region, shows no obvious stimulating the development of Tianjin and Hebei. Although the three regions are geographical proximity, they have not formed coordination the multifunctional, interactive city circle between the cities. Therefore, the purpose of this paper is to analyze their comparative advantages from the aspects of transportation, industrial concentration and labor, and then find out specific factors that restrict the development of Beijing Tianjin Hebei and puts forward corresponding suggestions. Analysis of the Influence Factors of Industrial Agglomeration in Beijing Tianjin Hebei regionKrugman put forward the "center periphery" model in the "increasing returns to scale and economic geography" published in 1991, which analyze how the regional integration to lead the industry in the same area average concentration of equilibrium change to a local equilibrium.On the basis of the "center periphery" model, many scholars have introduced new variables to analyze their impact on the industrial agglomeration. For example, Martin and Rogers (1995) studied the effect of infrastructure on regional agglomeration of manufacturing industries. Puga (1999) introduces the cross industry flow of labor into the center -periphery model, and emphasizes the importance of the elasticity of labor supply to the formation of industrial agglomeration. Fujita, Krugman and Venables (1999) were further analyzed on the basis of the center periphery model, and find that the relationship between the transpor...