The impact of climate change is causing obstacles for fishermen because of the increasing risk of fishing, changing seasons and fishing locations, uncertainty of the wind season, thus affecting the number of catches. Climate change conditions that disrupt marine ecosystems certainly can worsen the economic life of fishermen households. The decrease in fish catch will have implications on household income. Fishermen in Belu have dependence on fishery sector especially capture fishery. Local fishermen need a strategy to increase revenue through alternative livelihoods to adapt to erratic fishing season. One of the economic adaptation strategies that fishermen can do is adaptation of human resources in fishery households through economic activities outside the fishery. This research aims to determine the income of fishermen households, analyzed the contribution of alternative efforts to total household income and analyze the involvement of family members of fishermen and the time spent to perform alternative livelihoods in the border areas of Indonesia and Timor Leste. The research was conducted using survey method through interview and observation technique. The results suggest that alternative livelihoods should be developed as a form of adaptation fishing households in retained revenue caused by decreased income from the main livelihoods as fishermen due to climate change