Abstract The twon-country unitization(the TCU) is exhibited as a(continued on page new settlement structure in the human living space. The evolution of the settlement-location and distribution(the SLAD) is a neccessary product of economic development, which is in fact within the restriction of the factors affecting the economic development, and varies with the phases of economic development. The evolution of the SLAD has its own intrinsic law, which is not only adaptable to the economic development but also affects the speed and progress of regional economic development, and is a essential restricted factor upon the regional economic development. The TCU displays as the turning from spot-distribution to area-distribution of the settlement in the developed area, however, as the turning from spot-distribution to linear distribution in the undeveloped area. In modern society, convenient transportation, group effect, open in all directions are taken into consideration in the SLAD in the developed areas. While in the undeveloped areas, it still rely upon the natural resources extremely. The environmental selection of the SLAD in the TCU are mainly affected by modern communication, market, resouces and energy, and the modern Feng-Shui Theory take an important role as well. Therefore, the basic rules suggested of the SLAD in the TCU as following: comprehensive selection rule, dominant factors selection rule, elastic selection rule and development selection rule. In order to accomplish the general target of the TCU, we suggest that settlement ought to be divided into varieties of function districts, the relationship between the spatial structure of the settlement and the behaviour of the fucntion districts can be stated by the behavioural matrix, the optum model of settlement development can be introduced form the matrix.
1997, Vol. 12 
