Based on the analyzing of the mechanism and laws of town development, it is put forward that the zonal development of urbanization is a special case in Wenzhou coastal region. Firstly, the study area has only a narrow maritime plain, and the main traffic lines run through the middle of it. Regional production layout and town construction tend to agglomerate along the traffic lines. Secondly, the actual strength of regional economy are enhanced constantly because of the coastal advantageous location and flexible policy environment. Thus group distribution of industry and population agglomeration are promoted. Thirdly, the essential motive power of rapid development of urbanization is that domestic enterprises grow up and professional markets spring up vigorously under the "Wenzhou Model". The synthetical degree of urbanization(SDU)is an important index to study quantitatively town development trends. Especially, it is suitable for studying the growing stages of county town. Furthermore, the relationship between the zonal development of urbanization and the actual strength of economy, and the scales of town population may be expressed quantitatively by using the expansion width model of urbanization(EMU)in Yueqin city.