Conflicts and riots in institutional environment has decorated on mass media, both electrical and printing media recently years. The precipitating factors are various, over capacity, unjust treatment between prisoners, unfull correctional tools and others.The Writer has the research in the institution about incident not on 18 June 2000 and it used qualitative approach. The writer used a depth interview to a arrest, a prisoner and three staffs who to surpassed the not and who to secured the riot.The interview resulted that the pattern and factors of the not which done by the prisoners and the staffs was started by the prisoner's squeezing to the arrests who stay in block A. Then the institution made a policy who to forbid the prisoner come in and out block A.The prisoners didn't like the policy because the staffs also squeezing prisoners. Especially Sidik, he was disagreed to the policy and he was be the precipitator of the not. Other factors caused the riot are :1. Disappointment2. Unharmony relationship3. Discrimination4. Low salary