Objective: Target of this research is study of relation of between demographic and ecological factors with type of crimes that criminals do it. Method: Statistical universe of research to be whole of arrested criminals of Shiraz city in 1382 and sample population is the whole criminals of eight crimes: 1-Homcide 2-abduction 3-armed thefts 4-forgery 5-fraud 6-usuraption of titles 7- purse 8-usual thefts (including: theft of lodging, retinues, automobile, motorcycle, pick pocketing, store and private and governmental places) that number of them have been 2653 persons. Method of research is the quantitative and used technic is documentary survey. Inverse questionnaire has used for collecting of data. SPSS and correlation coefficients related with ordinal and nominal and Interval levels have used for analysis of data. Finding & Results: Analysis of relation between antecedent of penal, education and age did in two levels that there were significance relation between them in the nominal level but there were not significance relation between age and type of crime in the ordinal level. There were significance relation between population density and variables homicide, forgery, fraud, purse and usual thefts rates. But there were not significance relation between population density and variables abduction, armed thefts and usurpation of titles rates.