Taking part in to be KB acceptor among Fertile Couple Age woman in Countryside Jatijaya District of Gunung Tanjung Sub-Province Tasikmalaya in the reality still lower that is equal to 46 (51,1%) because pursuant to result of perception of fileld still many fertile couple Age as direct target of KB program do not protect by contraception drug or appliance. research conducted by at 90 responder that is Fertile Cuople Age woman which spread over region work Countryside Jatijaya District of Gunung Tanjung Sub-Province Tasikmalaya, target of this research that is to knowledge factor, family support, taken part in become KB acceptor (variable tied) in Countryside Jatijaya District of Gunung Tanjung Sub-Province Tasikmalaya Year 2007, used by research type is Explanatory Research and use survey method with approach of Cross sectional. Analysis Data result of research use Rank Spearman test and Chi square test at mistake level 5%. Counted 46 responder or equal to 51,1% taking part in in its KB still less, 26 responder 28,9% what take part in in its KB [is], and only 18 responder which take part in in its KB have goodness, that is equal to 20,0% from amount of entire /all accurate responder or or only some of just small. result of research [of] menunjukan that there is [relation/link] [among/between] knowledge (assess P 0,000), and support family (assess P 0,000),. suggestion in this research [is] so that improved [by] KB participant as one of [the] effort to [be] is secure and prosperous [of] society.