The research aimed at overcoming the fast growing number of street children, sheltering them, and providing them with supervision and guidance for better life. The research uses two variables namely Independent Variable (X) which is Training of ratefulness and Dependent Variable (Y) which is Well-Being Psychology. The research design is one Group pre and post test Group Design in which a subject group is measured and given treatment for a certain period of time and then measured again. The data of the research are quantitative which will be obtained from the psychological well being measurement of street children. The data were collected using scale, interview, and documentation. The research result indicates that the training of gratefulness in improving the psychological well being of street children based on the si x aspects of self-acceptence, positive relationship with others, economy, environmental mastery, life goals, as self-development is affective.