| The economic field combines field theory of physics of natural science with economic theory of economics of social science. It is an economic space .In traditional economic, it is familiar with growth pole, location advantage, and accumulative effect. It is a new interdisciplinary concept. The theoretical concepts and mathematical model have been researched and established. Include the concept and variety, which are scalar field and vector field, stationary field and non-stationary field. Economic field is objective, an example has been taken. The general characteristic of economic field is radiation, superimposition, periodicity, convertibility and vortex. The concept of economic field has been researched; include field source, field density, field flux, scalar potential, vector potential. The mathematical model of economic field based on space coordinate is set up.The poverty belt around Beijing and Tianjin include 32 poverty-stricken counties of Hebei province, they surround Beijing and Tianjin, but economic and social development is extremely backward. The scope of the poverty belt around Beijing and Tianjin is drawn, the gap between the poverty belt and developed cities has been explained vivid, and the cause of formation has been analysis.The theoretical concepts and mathematical model have been used to analysis the poverty belt around Beijing and Tianjin. Firstly, the economic field gradient model of the poverty belt around Beijing and Tianjin has been set up. The clustering method has been used to test the degree of reliability. Secondly, the Indexes System of the poverty belt around Beijing and Tianjin has been established. The principal component analysis has been used to test the indexes system. Finally, factor analysis has been used to get the 5 parts of problem of the poverty belt around Beijing and Tianjin. Include the construction of ecological environment and the level of natural resources, investment level and infrastructure construction, industry development level, agricultural development level, education, employment and medical skills. |