The objective of this thesis is to define the factors of households labour substitute demand during some labour force age (13-59 years) temporary migrated. This thesis is based upon the 1995-1996 Survey of Population Change in Thailand of Phase I (July-August 1995) by the National Statistical Office. The unit of analysis is the household, and the dependent variable is the number of laborers who temporarily migrate into households. The independent factors are the temporary out-migration from households, dependency ratio, the household production structure and the household area. The basic assumption is that there is no correlation between each and every independent variable, which are analyzed by multiple regression analysis. From the 7 models analysis, it may be concluded that the high number of labourers who temporarily migrate out of households is not related to household labour substitute demand, no matter whether the migrants are male or femal. However,when controlling for the number of labourers who temporarily migrate out. it was found that there is a statistically significant correlation between household labour substitute demand and the number of labourers permanently living in a household, Child and Age Dependency Ratio, the temporary migration of family leaders,the number of grandchildren, household production structure and the location of the household. These factors affect household labour substitute demand when migration occurs. It is recommended that the migrant labour force should pay more attention to children and elder people so that they are be taken care of. Migration to urban areas in the Central and Northern regions should be promoted to ease the labour shortage; whereas, migration both across regional boundaries and within region boundaries to the provincial areas in the North-Eastern and Southern regions can provide a sufficient labour supply.