Teen issues today are very complex and worrisome. Adolescents aged 14-19 years admitted had a
sexual friend premarital respectively reached 48.6 % and 46.5 % (IYARHS, 2002-2003). The study
aims to determine the effect of giving health methode peer group on young women’s reproduction
helath attitude and knowledge improvement. Research design is simple quasi-experimental with
randomized pretest-posttest design . 21 students in SMAN “X” East Jakarta as samples. Analysis is
used to test hypotheses using paired T-test. Respondents univariate characteristics test results mostly
16 years old, second son, Islam, parent’s job and education are employee and highschool. Health
reproduction knowledge level rate score increased 1.61 points with difference deviation standard
level 1.27 and mean attitude 0.38 points with difference standard level 3.23, before and after
intervention . Bivariate looks difference mean knowledege between before and after treatment 1.55
with standard deviation 2:04 and probability value 0.003, concluded there was significant difference
between attitudes before and after treatment. There is difference attitude mean between before and
after treatment 5.98 with standard deviation 0:38 and probability values 0.773, concluded there was
no significant difference between attitudes before and after treatment .