Delinquents crime make worry not only Lithuanian, but public in other world countries too. We have to look for the answers , why young people make more serious crimes with the time and become more agressive. The principal aim of this paper to analyse delinquents’ behavior and self- esteem. Research tasks: to compare delinquents’ and persons’ who do not brake the law , self – esteem and attitude towards their family members; to compare the level of agression of persons’ who do not brake the law and delinquents’ . Research hypothesis : the level of agression of delinquents’ is higher than persons’ who do not make crimes . Research methods : • Self – esteem was measured by the semantical differencial type scale development by D. Beresnevičienė ( 1995). • Not - existing animal drawing method by E.C. Romanova ( 2002). The gotten data of the research confirmed the hypotesis. The level of agression of delinquents’ is higher than persons’ who do not brake the law ( t ( 141) = 3,204, p< 0,05). Comparing persons’ who do not make crimes and delinquens’ self- esteem, the latest ones’ self- esteem is higher (t ( 177 ) = 2,090, p>0,05 ). Delinquents take them selves as more beautiful ( t ( 198 ) = 2,184 , p< 0,05 ) and more active ( t ( 177) = 2,614, p< 0,05 ) than persons who do not brake the law.