Background: Reproductive health is still a problem of public health that have largescales in Indonesia. Phenomenon that occurs in public during this indicates that sexualbehavior youth and sex pre marriage in adolescents continually increase from year toyear. One of prevention that can be for the provision is education through extensionactivities. Extension that used is by using the whole group discussion method that willbe used to know attitude in the prevention teen pregnancy. This research have aims to know attitude in the prevention teen pregnancy with counseling uses the wholegroup discussion in junior high school 3 Kasihan.Method: This research using a kind of Quasi Experiment with one group pre test andpost test design. The Population were 119 students in IX class. The sample collectionwith simple random sampling and there were 55 samples. The method of analysis databy using paired t test.Result: Based on the results of pre test and post test its mean value of pre test 61,75,while value post test 64,74. T count of -5,877 and the significance is 0,000 (p< 0.05).The results of the difference attitude before and after given intervention that its meanvalue post test is higher than its mean value pre test. The conclution of reserch is achange in attitude students IX class in teen pregnancy prevention in state givenintervention in the form of counseling with the methods whole group discussion.Keywords: Teenagers, counseling, a method of whole group discussion, teenpregnancy.