So that it is necessary and urgent to build the scientific , efficient and feasible system of the yrd regional general traffic networks . building the modern general transportation combined with road , railway , waterway and aviation will promote cities in yrd region to be integrated into yrd regional urban group both in the form of spatial structure and in the mode of integrative economy . building the developed integrative transportation will highly speed the development of the yrd region and the national economy 只有构筑科学高效而又切合实际的区域综合交通运输网络，建设发达的公路、铁路、水路、航空综合运输系统，将长江三角洲各大小城市连成一体，真正形成空间结构和社会经济一体化的长江三角洲城市圈，才能产生区域整体系统的集聚效应，为长江流域经济以及全国经济发展做出贡献。
The author of this paper do believe , with the gathering effect of modern city strengthens , the number of underground street , soil - covered building . underground business and industry facilities , tunnel of hole and underground synthesize will be more and more the underground space of three dimension consisted of point , line and flat surface will be one of the main content for modern city 笔者认为，随着城市集聚效应的增强，城市地下街、掩土建筑、地下商业城以及工业和商业用途的隧道洞室等多种地下综合体将越来越多，预期点、线、面相结合的三维形态地下空间必然成为现代化城市基本组成内容之一。
Because of the rapid development of urban economy and the agglomerative the which is higher than that of general cities , big cities are developing at a surprising speed and their scale and number are increasing rapidly the development of big cities also leads to a series of urban illness such as the deteriorative residential condition , traffic congestion and urban environment aggravation , so researching urban structure pattem - is an important subject of modern urban planning 由于城市经济的高速发展和具有比一般城市更高的“集聚效应” ，大城市以空前的速度迅速发展，城市的数量和规模急剧增长。但是，大城市的高速发展也导致了诸如居住条件恶劣、交通拥挤、城市环境恶化等一系列“城市病”的产生。
The promotion of industry development , the apparent employment function and service function of tertiary industry are the reasons why tertiary industry has more and more driving function to urbanization . the driving function of urbanization to tertiary industry is becoming apparent because of agglomeration effect of urbanization and the agglomeration characteristic of need for tertiary industry . the cities " agglomeration scale affect the need scale and structure for tertiary industry , thereby affect the scale and structure of tertiary industry 第三产业需求的集聚性和高的收入弹性以及工业化集聚的经济特性解释了第三产业是到工业化发展到一定阶段后成为城市化主导动力；经济结构的进化与第三产业强大的就业效应、服务效应是城市化对第三产业依赖性日益增强的三个主要因素，城市化的集聚效应以及第三产业需求的集聚特性使得城市化对第三产业发展动力作用也日益明显；城市的集聚规模影响第三产业的需求规模和结构，从而影响第三产业的规模与结构。
With form the reform open up deeply , with the flourish development township enterprise , our small town develop quickly . the number is more and more , while the quality is not good . many problems come out for example land reducing , serious environmental pollution and so on . especially the small town scale is too small , which has influenced on sustainable development of the small town 特别是小城镇的规模太小,很难形成集聚效应,第三产业不发达,在很多方面显出萧条的征兆,严重影响了小城镇的可持续发展。人口规模是城市规模的反映。从理论上讲,第二产业的过度分散,城镇人口规模太小,难以达到第三产业服务的人口门槛规模,从而也就无法形成有效的社会需求。
The followings have mainly contributed to the " two - win " effect of the regional economic cooperation : adjust the productive forces ' attribute combination in the way to intensify structure effect , adjust productive forces ' time combination in the way to give a full play of the " synchronic effect " , adjust productive forces ' quantity combination in the way to get " accumulation effect " , and adjust productive forces ' space combination in the way to obtain " multiplier effect " 摘要区域经济合作之所以可以获得“双赢”的效果，主要是调节了生产力属性组合增强了结构效应，调节了生产力时间组合发挥了“同步效应” ，调节了生产力数量组合取得了“集聚效应” ，调节了生产力的空间组合获得了“乘数效应” 。
Then it makes a general analysis on the current status of urbanization in the northeast and the development trends of urbanization in the world and gains following inspirations : first , industrial agglomeration is an important factor to promote the process of urbanization in the northeast ; second , the positive development of central cities in the northeast is the inevitable choice at this stage ; third , technological progress and innovation is the key to achieve competitive advantages ; fourth , effective institutional arrangements and policy innovation can give play to the effect of industrial agglomeration and accelerate urbanization process 然后对东北地区城市化的现状以及世界城市化发展的一般趋势进行了系统分析,得出以下启示:第一,产业集聚是推动东北地区城市化进程的重要因素;第二,积极发展中心城市是东北地区现阶段城市化的必然选择;第三,技术进步与创新是取得竞争优势的关键;第四,有效的制度安排与政策创新能够发挥产业集聚效应并加速城市化进程。
