The increasing flows of internal migrants resulted from urbanization in developing countries is of great interest to policy makers. This study examines the individual-level and household-level social surveys the Nang Rong Project in 1994-1995 and 2000-2001. Individual characteristics such as gender, age, and years of schooling, and household characteristic such as family size are, significantly and consistently with the human capital model and previous empirical studies, shown to be determinants of a migration decisions. Moreover, migration selectivity differs significantly by migrant destinations. These findings indicate that policy makers should also consider different destination choice of migration, as well as the migrants’ characteristics, when they try to influence migration patterns and flows.