<strong>Background:</strong> The  poor  of  HIV/AIDS  knowledge  to  be  cause  the  teens  promiscuity.  Related to this, the author intends to do a research with a title “ The influence of educating  HIV/AIDS health associate with free sex  lifestyle attitude  toward  the  teenage  students  of  class  11  IPS  3 SMA  I  Kristen Surakarta  Objective:  To  determine  the  influence  of  educating  HIV  /  AIDS health toward  the  teenage  free  sex  life  style  attitude  of  the  students  class  11  IPS 3 SMA I Kristen Surakarta.  Methods:  The quasi-experiments  to  determine  the  influence  of   education  HIV / AIDS health associate with the teenagers free lifestyle attitude by using one group  pre  test  and  post  test  that  compares  the  results  before  and  after being given educating HIV/AIDS health.  Result: The Paired t test used, the caunting t result is -2, 914 with alpha 5% ( 0,05)  obtained  the  p  value  of  0,000  &lt;  0,05  it  mean  Ha   accepted  and   Ho rejected.  Conclusion: The educating HIV/AIDS healh influence to the free sex lifestyle attitude of the students of class 11 IPS 3 SMA I Surakarta.  Keywords: Educating HIV/AIDS health, Free sex lifestyle attitude teenagers