A descriptive study was conducted to assess the effectiveness of Behavioral Change Communication on knowledge of self care management of diabetic foot ulcer among diabetic clients in Mappedu village. The objectives of the study was to assess the level knowledge on self care management of diabetic Foot ulcer among diabetic client in the pre test, To assess the effectiveness of behavioral change communication on self care management of diabetic Foot ulcer among diabetic client in the post test and To associate the post test level of knowledge with demographic variable Totally 50 samples were selected using convenient sampling technique. The researcher developed a structured interview schedule to assess the demographic variables of the samples .The pre test level of knowledge is assessed using questionarrie and then after completing pre-test the investigator administered vedio assisted teaching on diabetic foot care to the clients. Then the post test were conducted to the samples with the same structured questionnaire. The data were analyzed by using descriptive and inferential statistics.The findings of the study reveals that out of 50 samples in pre test 0(0%) had adequate knowledge, 17(34%) had inadequate knowledge 33(66%) had poor knowledge and in post test 35(70%) had adequate knowledge, 15(30%) had inadequate knowledge and 0(0%) had poor knowledge. The calculated ‘t’ value for experimental group was t=6.47 which is found significant at P>0.05 level. So the Behavioral Change Communication on knowledge of self care management of diabetic foot ulcer among diabetic clients is effective.