以1990年和2000年两次人口普查资料为基础，分析了重庆市外来流动人口迁入的原因、特点、构成和变化特征。认为:(1)2000年和1990年相比，市外迁入的人口比例增加，随着市场经济的发展，以经商为动因的人口迁移增多;(2)城乡建设和第三产业在提供流动人口就业方面发挥着重要作用，流动人口是重庆市从事建筑业和第三产业中相对低端行业的主体;(3)外来流动人口的来源地仍较集中，以四川省为主，但人口迁移不再仅仅决定于地缘联系和迁移距离，经济差异与互补也起到越来越大的作用;(4)源于农村的流动人口所从事的行业与其原来的行业有较大差异，并且市内和市外迁入的流动人口的行业结构差别也很大。

Based on the collected data of population census of 1990 and 2000, this paper analyzes the causes,Characteristics, structure and changes of the floating population in Chongqing Municipality. More and more surplus laborers wanted to find jobs in more developed cities and regions and the movement to urban has bolstered the municipality economy, particularly rural economy. This paper holds: 1) Compared with 1990,along with the increasing of attraction to other place, the proportion of floating population from outside of the Municipality increased rapidly in 2000. Among them, the merchandise driving force effected efficiently. 2)The construction industry and the tertiary industry accepted a large number of the immigrants, in the meantime, the main body of the immigrants was working as construction and services in the large city. 3) The home area was convergence while the transfer of migrants didn't correspond to the distance or the regional interactive relationship. Moreover, it's a more important reason that the difference of regional economic development became prodigious in the last 10 years. So, the regional economic has complementally effect each other. 4) The professional structure of the floating population came from rural area was different with the prevenient status. There has great difference between not only present situation and prevenient status but also between inside and outside of the municipality.