引言近年来人口自愿在境内或向境外迁移的主要原因在于各国内部和各国之间存在着不断增大的社会发展程度的差异。不论其原因还是其后果，均与经济上、政治上、社会上和人口上的诸方面有关（海泽尔，１９８２年）。就其本质而言，人口迁移至少涉及三方：移居者、来源地或来源国 Introduction The main reason why the population voluntarily moves within or outside the country in recent years lies in the ever-widening differences in social development within and among nations. Regardless of its causes or its consequences, are related to economic, political, social and demographic aspects (Hazel, 1982). By its very nature, population migration involves at least three parties: migrants, origin or source country