Abstract: Based on the resident’s welfare, the author creates a system which can be used to measure the optimum of each central place system and to analyze the total gain and loss when its subsys-tem changes from one form into another. In the welfare system,k=3 system means less average transport distance and time, therefore higher welfare level; k=4 and k=7 system improve resident’s welfare level by deducing transport cost rate and administration cost, respectively.Through the system created, the relationship between central-place system and economic-development is observed. The results demonstrate that from autarky to developed economy, the central-place system will evolve successively as follows; k=7; complex systems of k=7 and k=4; k= 4; complex systems of k= 4 and k= 3; k= 3.At the end, with the central place theory and the system above, the author manages to give the point-axle system a perspective. The conclusion is that the point-axle system is suitable for the developing economy, and market principle (or k= 3 system) is more suitable in relatively de-veloped regions.

Key words: welfare measure, systematic substitutability, point-axle system