The purpose of this paper to know decision making plan of urban migrant people of urban slam in Dhaka city in the context of climate change. Besides this study also make out the reason of migration for the settlement of urban slam and the current socio economic situation and vulnerability of those who have moved to urban as slam dwellers. The study conducted at two slum of Dhaka with purposive sample survey, KII and in depth qualitative interview of selected climate migrant slum dwellers. The study found that migrants residing in urban side-line of Dhaka city slum have been using migration as livelihood or survival strategy for quite some times. Mainstream migration literature of Bangladesh mostly highlighted economic, social and demographic challenges as drivers of rural‚ urban migration. This study found that many economic, social and demographic challenges that led to migration decision of the slum dwellers are deeply bounded with the environmental or climatic stresses of the areas of their origin. Migrants of Dhaka slum mostly experienced environmental stresses, i.e. riverbank erosion, cyclone, flood, water logging drought and salinity. In other words, these groups of people have taken help of different types of migration (short-term, cyclical, seasonal or permanent) to adapt to the changes that took place in their lives due to social and economic reasons influenced by climatic stresses. After migration city slum’s vulnerability represents necessary reformulation of the existing policies on migration in the context of climate change. This study effort to identify the major climatic stress and shocks in the decision to migrate. It also clarify livelihood pursued by migrants and other house members. This study is on adaptation strategies of urban migrants in the context of climate change.