In this article reviewed problems of the criminalistic classification building of a person. In the work were used legal formal, logical, comparative legal methods. The author describes classification kinds. Reveal the meaning of classification in criminalistic systematics. Shows types of grounds of criminalistic classification of a person. Identified and substantiated grounds of classification of a person in criminalistics. On the basis of conducted research by the author, it is proposed to insert changes in the previously used definition of the first-order basis of classification of a person in criminalistics. The author analyzed and showed correlation between criminal law of republic Kazakhstan and republic Mongolia with the goal to make a parallel of a second-order basis of criminalistic classification of a person. Contained conclusions can be used in the work of law enforcement authorities to increase in efficiency, and also during specialists training in disclosure and investigation of crimes in juridical educational establishments. Correctly made criminalistic classification will help to make reforms in prevention, investigation and disclosure of a crime.