Through analyzing the two common evaluation indexes of intersection traffic condition,consist of intersection traffic capacity and intersection saturation degree,and on the basis of determining service level of each directional traffic line,the feasibility of grade crossing be separated can be determined comprehensively according to the position of grade crossing in the urban density area.

This paper analyzes on the theoretical foundation of the tighten city morphology and the problems existing in it, and points out that only controlling the urban density in a rational scope could implement the sustainable development of the city.

Because the route standard of the high speed railway is higher than the ordinary railway, the most difficult problem concerned with high speed railway passing through city is how to deal with the interrelation between the high speed railway and the existing buildings, especially concerned with a large number of buildings to be removed and to match with the city planning furthermore.

On the idea of urban greening in compact city in China;

The comparative study on the changes of population structure of three urban agglomeration areas in China;

Research shows that since 1980s,the population growth in urban agglomeration areas has accelerated,the population scale has been expanding continuously;the population distribution has changed to a great extent,of which the general trends are centralization;the states of t.