The article discusses the possibility of prediction in combating crime in envisioning ways to improve the efficiency of law enforcement to impact crime through criminal law and other measures. Underline the fact that specified in the scope of this article aspects of domestic criminal law theory has not worked out common approaches, as evidenced by ongoing discussions on this issue. In particular, there is no common understanding of the logical-linguistic phenomena, among them the basic concept: "measures of criminal and legal impact", in connection with which the article is their original definition. For criminal law science, as with other legal Sciences remain difficult surveys to develop criteria for an effective impact on crime and forecasting. The paper presents the concept of "work" and management practices of law enforcement agencies on the effective application of measures of criminal and legal impact on crime and, primarily, on the basis of one of the main objectives of the criminal law - the prevention of crimes. The structure of this scheme consists of four groups that must be included in the development of forecasts in the sphere of fight against crime and its control and management. Is this: criminally-legal measures of crime prevention are in the educational effect on volatile and other persons and do not involve criminal responsibility; criminal-legal measures of crime prevention with the prevention of harmful consequences of the criminal act, deprivation of an offender to continue criminal activities, etc. achieved in the PU, the application of the perpetrators of legitimate violence (necessary defence, detention of the criminal) and criminal-law enforcement (criminal prosecution for preparation or attempted crime or completed less severe, compared to warned a crime); criminal - legal measures of implementation of criminal responsibility; other measures of impact on crime in furtherance of the purposes of criminal liability, beyond the considered groups, although having a number of their characteristics, as the application of the procedural measures of restraint in respect of suspects and accused persons, the application of compulsory measures of a medical nature to condemn alcoholics and drug addicts, all that is subordinated to the goal of preventing recurrence of crimes. Considering the issues of measures of criminal and legal impact on crime in connection with the prediction of the whole sphere of combating crime and related law enforcement the article notes the broad approach to the application of measures of criminal and legal impact on crime from the point of view of direct use of such measures in law enforcement for the prevention, suppression of crimes and the implementation of criminal responsibility is gained, sitela, which are based on criminal and other laws regulating the fight against crime. From the point of view of assessing practice effectiveness of the application of the criminal law as observationsas measures, the paper proposes to evaluate it according to formal parameters: the number of publications and broadcasts on television and radio, lectures, etc., and the effectiveness of these measures, as individual preventive measures is proposed to determine two parameters: the rate of detection of potential offenders (by retrospective analysis of the criminal cases of intentional crimes); the level of the positive impact of advocacy on identified potential offenders (by definition of the dynamics of the share of those who have committed crimes).