The basic responsibility of the army during the peace time is to support the state bodies also the Police to keep the national security of the country. Whether this task is performed effectively or not depends on the quality of the cooperation between those parties. The duties of representatives delegated to organize cooperation between the Armed Forces and the Police were specified in various legal acts in different level of details and often without clarity of the subject. As a result of it, the subject of cooperation is regulated for the moment by signing bilateral agreements between interested institutions on separate levels of decision authority. The areas of cooperation between the Armed Forces, Military Police and the Police are realized on the basis of appropriate legislative acts and signed agreements and they include: information exchange, joint preventive and operation activities, investigative measures and logistic support. The current law and signed agreements allow to realize cooperation, however in the future the model of cooperation between those institutions should be concentrated on not only the exchange of experiences and information but also organization of joint exercises and trainings. The highest level of importance should be given to the aim of common training and exercising armed forces and police assets prepared to fight the terrorism. This training ought to be preceded by accepting common procedures concerning information exchange, cooperation, management and mutual relations between participants during the counterterrorist operations, so it consistently would improve effectiveness of the action during the real crisis situations.