It points out that we can t discuss the development of towns in a point of view restricting on a town itself,but must concern with the optimizing output of the whole urbanization system and the virtuous mutual motion of the “dual track” urbanization system of our country and prevent vicious circle.

It is followed by an examination of the trend of dual-track urbanization and its implication on the spatial development of the Pearl River Delta.

According to dual-track urbanization, the urbanization levels are adjusted for each.

On the background of globe economy system, urbanization and urbanization mechanism are emphasized.

Small number turnout holds a major market share and plays the immeasurable role in urban rail transit.

With the rapid development of urban rail transit in China, vibration and noise pollution induced by train operation become more and more serious.

This article analyses and discusses some based train position methods based on communication technology, and gives some suggestions for Chinese high-speed railway train position and for urban rail transit train position .