The peaceful reunification of the Korean peninsula is our eternal cherished-wish that our nation should achieve. Security police is in charge of a lot of support services so that the defectors can adapt themselves to South Korean society in order to meet the government's goals. North-Korean defectors, in the North-Korean military area, have conceptually address, the immediate family, spouse, workplace, etc., but they fails to acquire a foreign nationality since they defected out of North Korea and out of the people, who arrived in South Korea. North-Korean defectors in South Korea are struggling to adapt to the current society due to a variety of social-causes. The reasons that North Korean defectors in South Korea are unable to adapt to society are shown in the various ways such as economic difficulties; lack of awareness against crimes; health problems and psychological problems. Accordingly, there are different opinions on supporting-measures which can help to adapt the defectors to South-Korean society, but for supporting welfare , the first, it should be strengthened to take preventive activities on the exposure of their identities, the second, through the part-revision of the revocation-system on the special contract of the rent-house, the measures on the welfare-support system for the North-korean defectors should be provided.