Making use of the data affecting the demand of health insurance from all the mainland Chinese provinces in 2011, this paper gets crosssectional data of commercial health insurance demand factors and empirical analyzes the demand elasticity of health insurance in the eastern, middle and western areas by constructing a multiple linear regression model. The results demonstrates that the changes of this demand is affected significantly by that of the population and per capita GDP. In the meantime, the change presents some regional difference among the eastern, middle and western areas.