城市在扩展,人口在增长,城市化过程在加快,这是许多发展中国家共有的现象。人们预计,到本世纪末,全世界人口将增加到63亿,其中城市人口将是35亿。新增加的人口将主要降生在发展中国家里。而在这些国家中,城市人口的增长速度一般都超过全国的人口增长。到2000年,发展中国家的城市人口将从70年代的4亿6千万人增到14亿以上。这就意味着,即使在本世纪最后的20年中,在这些国家中将城市用地和城市中的建筑面积都扩增一倍,也很难适应人口增长的需要。某些发展中国家城市人口增长较快的原因,一是由于农村人口流入城市,一是城市人口中低收入居民的生出率特别高。据国际发展研究中心对万隆、汉城、加拉加斯、吉隆坡、伊斯坦布尔、利马、马尼拉和拉各斯8个城市所作的调查统计,这些城市的贫民窟中的人口增长率是城市其它部分的2至3倍。不 Cities are expanding, population is growing, and urbanization is accelerating. This is a phenomenon shared by many developing countries. It is expected that by the end of this century, the world’s population will increase to 6.3 billion, of which the urban population will be 3.5 billion. The newly increased population will be mainly born in developing countries. In these countries, the growth rate of the urban population generally exceeds the national population growth. By the year 2000, the urban population in developing countries will increase from 460 million people in the 1970s to more than 1.4 billion. This means that even in the last two decades of this century, doubling the area of ​​urban land and urban construction in these countries will not be able to adapt to the needs of population growth. The reasons for the rapid growth of urban population in some developing countries are as follows: First, the rate of birth of low-income residents among the urban population is particularly high due to the inflow of rural residents into cities. According to surveys conducted by IDRC on eight cities in Bandung, Seoul, Caracas, Kuala Lumpur, Istanbul, Lima, Manila and Lagos, the population growth rates in the slums of these cities are the other parts of the city. 2 to 3 times. Do not