The state prison class I , which is located at the Central Jakarta and frequently called Salemba Prison , currently the number of it's inmates is already overcrowded by four folds of it's normal capacity, Therefore it can cause inconvenience to the inmates who are serving their respective sentences . This poor condition can spark diction of different interest among the prisoners in order to maintain themselves or their groups.While spending their time to serve their punishment , a number problems may emerge the so-called sub prison-culture in the form of suppression and exploitation by the strong groups against the individual or minority groups within the prison, which surely will cause the insecurity . It will also lead to the break-up of the friendship ness among the inmates themselves.This evaluation is trying to reveal the forms and factors that cause the worsening security condition and the anticipation measures that have been taken by the Salemba State Prison Official to overcome such poor situation in order to apply a proper security anticipation measures at the State Prison Class I.Based on this research result, it reveals some forms of riots sparked by the prisoners due to which is due to the suppression and exploitation against individual inmate or group of inmates, which also emerge due the different cultural background of the prisoner or group of prisoners, that eventually ignites cultural conflicts among the inmates.The author have some suggestions as to where to place the prisoner and the inmates under their respective tribal background and region of their origin in order to to reduce the risk of riots at Salemba State Prison class I.