This study was designed to testify the effects of Community-based mental health program on burden of family carers of mentally ill patient. The sample of this study consisted of 26 family carers whose mentally ill relatives were registered with a certain health center in Seoul and attending this program. The study was conducted for 1 year from the beginning of August 1996 to the end of August 1997. Subjective and Objective Burden Measurement was used to measure burden of family carer. This tool was originally developed by Montgomery(1985) and revised by researchers to 4-point Likert type scale. Data were collected three times : in month one, six and twelve, and analyzed by SPSS PC^+. During the program, burden of family carer was significantly reduced so that main hypothesis and three sub-hypothesis were all supported(main hypothesis p=0.00, 1st sub-hypothesis p=0.00, 2nd p=0.00, 3rd p=0.001). In conclusions, Community-based mental health program can reduce burden of family carers by helping them to continue their life and to function as a good support system for the chronic mentally ill relatives. The researchers, therefore, propose that this program should be extended to the other place and be supported by local and central government.