This thesis discusses the function of law enforcement in the era of regional autonomy under Article 2 of Law No. 2 of 2002 on the Indonesian National Police in the city of Pontianak. The method used in this study is a socio-juridical approach. From the results of this thesis can be concluded as the reform efforts to improve the livelihood of Governance and Development in the form of a change from centralized to decentralized, intended as the acceleration process of achieving national objectives, namely the creation of a just and prosperous society. Decentralization means the delegation of powers to the Autonomous Region of Central Government to run the government as well as regional development sendiri.Desentralisasi been, because in this system enable even better democracy and provide space and access freely to the community to participate in all areas of governance and development. So the implementation of governance and development are not solely based on the government or the state, the public will play a part and give kontribusinya.Selain positive things that have been able to be achieved by the Reformation, as mentioned above, it also followed a negative impact mainly concerns the behavior of the public. At this time changing people's behavior caused the reforms implemented so quickly, involving almost the whole order of life, also result in changes in the existing social order. From the changing social order that ultimately affect people's behavior to change as well as a reaction to the changes that occur. Behavior change is actually a social phenomenon that can arise at any time and by any cause, and it will become a problem when such behavior is contrary to the norms and values, which in turn it will hamper the implementation of the process of government and development itself. Democracy is translated as freedom of action of individuals who freely and participation addressed by coercion-coercion will. Police as the formal institution according their main duty, highly demanded to carry out its function and role to be able to present the situation of security and public order conducive thus enabling governance and development can work well. Efforts to make it happen, given the limited resources available, the police not only through law enforcement (Low Enforcement), but also followed by efforts that are prevention, namely Pre-emptive and Preventive. Law enforcement purpose to force obey and follow the existing norms and values, is being implemented with the aim of prevention grow and develop deterrence from within the community. So dominant sendiri.Pelaksanaan public order law enforcement and public security in accordance with Law # 2 of 2002 on the Police, can not be implemented fully or substantially total impossibility of enforcement because the law can reach out to its destination (order, order and justice) for their influence and intervention in its implementation. Here the role of police discretion to decide cases of criminal cases handled by police. Discretion granted by operational officers in the field directly on the spot and without asking for directions or decisions of his superiors an Individual discretion. Discretion based or guided by the policies of the leadership in the police organization is bureaucratic discretion.