Migration is shift from a place of residence to another place for some length of time or permanently including different types of voluntary movements. It has great impact on economic, social, cultural and psychological life of people, both at place of emigration as well as of migration. Hence, the present study makes an attempt in unravelling the issues of socio-economic conditions of the migrant unorganised workers and its impact on their livelihoods. The present study has covered Tirunelveli District. The data relates to the month of September 2015. The primary data was collected with the help of specially prepared interview schedule.  Totally 90 respondents were selected using simple random sampling method. This is purely a descriptive study. For analyzing the data statistical tools such as percentages, averages, Chi-square tests, Garret ranking method and probability analysis technique were used.  The study shows that out of 90, 67 respondents are migrating due to non-availability of work in their villages. Only 3 percent of respondents are migrating due to supplement their family income.  7 and 16 per cent of the respondents are migrating due to livelihood and to provide good life for their children respectively. The Chi-square analysis reveals that the factors are Age and Education are significant at 1% level. Motivation about migration and decision of migration are significant at 5% level of significance. The remaining factors are not significant at 5% level. It is found from the study that the inadequate availability of local employment was ranked first followed by low wage rate.  Inadequate income to meet the household needs was ranked third and long hours of work ranked fourth.  Lack of bargaining power was ranked fifth. The Government of Tamilnadu should also maintain a demographic balance by regulating the inflow of migrants. Unless the government provides the basic necessities of life to the rural areas and provide the productive youth in the rural areas with employment opportunities people will continuously drift in to the urban centres from the rural areas in search for better life and employment.