Population control efforts can be done in various ways both with contraception and non-contraceptives. The implant is a contraceptive device that is installed under the skin layer on the upper arm of the inner side. The research aims to know the relationship of knowledge and attitude of mothers with the use of implant contraceptives in the village health post Bonandolok year 2020. This research uses a crossectional design. The population in this study was the entire mother who was at Bonandolok Village Health post as many as 138 people and samples used 58 people. Data analysis Using Test square. The results of the Chi-Square test show results.  Based on the results of the study showed that there is a knowledge relationship (P = 0,000), attitude (P = 0,000) with the use of implant contraceptives, it can be concluded that is expected to the acceptor planning to be able to take the time to follow the counseling organized by health workers in the public health center about implant contraceptives so that it can improve knowledge, attitude, and skills of the KB.