In the article preventive functionings of Police and their impact on safety were described. A structure of Police as the subject was discussed in the security system and of public order, organization of Police, tasks of Police, strategies of functionings of Police, the basic concepts associated with the crime prevention, preventive tactics grasping issues of ways and methods of preventing actions of criminal activity, systems of the activation. Tools serving the realization of the improvement in the safety were presented social. An essential role of Police was noticed in the system of the state security, which besides other services, i.e. the Border Guard, the military police, the Internal Security Agency, the Foreign Intelligence Agency and the Central Anticorruption Office, has the task of being based on a guard of the state security and citizens. They mentioned that functionings of Police should aim also at ensuring constitutional order, political stability, democracy and the public order. A superior role of preventive programs in the widely comprehended safety assurance was highlighted social, for propagating them in groups peculiarly exposed to crime-related behaviours. Amongst addressees of preventive action they distinguished, young people as group particularly susceptible to diverse influences, where it is necessary to carry preventive programs out with the great commitment. They showed that their correct conduct in the more distant perspective could effectively contribute to reduce crime and hence the improvement in the safety.