Cilem diplomove prace je popis vztahů mezi vybranymi osobnostnimi rysy adolescentů a různymi formami rizikoveho chovani. Prvni kapitola teoreticke časti je zaměřena na obdobi adolescence popis bio-psycho-socialně-spiritualnich změn v osobnosti dospivajiciho, kognitivniho a moralniho vyvoje, emocionality, socializace. Dale se věnuje teoretickym konstruktům rizikoveho chovani, odlišnosti normy a normality, typům rizikoveho chovani. Nasleduje popis rizikovych a protektivnich faktorů a vybranych osobnostnich rysů. Většina kapitol je doplněna vyzkumnymi studiemi na toto tema. Na zakladě zvoleneho kvantitativniho vyzkumu byly použity čtyři dotaznikove metody, jejichž psychometricke vlastnosti jsou popsany v jedne z kapitol vyzkumne časti - "Vyskyt rizikoveho chovani u adolescentů" (VRCHA); "Škala osobnostnich rysů adolescentů" (ŠORA); "Škala osobnostnich rysů představujici riziko z hlediska uživani navykovych latek" (SURPS) a "Škala depresivity" (SDDSS). Cilovou vyzkumnou skupinou byli studenti gymnazia ve věku 1519 let. Se studenty a studentkami byli provedeny tři šetřeni a administrace se tykala vždy stejnych respondentů. Kapitola popis a interpretace vysledků přinaši informace o prevalenci vybranych druhů rizikoveho chovani (nejčastějši typem rizikoveho jednani je uživani alkoholu, zaškolactvi falšovani podpisů rodičů); odhaluje vztah mezi některymi osobnostnimi rysy a rizikovymi aktivitami (impulzivita, vyhledavani vzrušeni, negativni myšleni, stav depresivity, nadšenost).This master thesis describes relationships between particular personality traits of adolescents and various forms of risk behaviour. The first chapter of theoretical part is focused on a particular period of time in the life of adolescent description of the biopsycho- social-spiritual changes in youth personality, cognitive and ethical development, emotionality and socialization. Followed up by a theoretical concept of risk behaviour, norm´s difference and normality, types of risk behaviour. Ending with a description of risk and protective factors and specific personality traits. The vast majority of all chapters is complemented with a research study. Based on the selected quantitive research four different questionnaire methods were used, whose psychometric characteristics are described in one of the research chapters ,,The presence of a risk behaviour among adolescents" (VRCHA): ,,Personality traits scale among adolescents" (ŠORA): ,,Personality traits scale creating risk within the usage of drugs" (SURPS) and ,,Scale of depression" (SDDSS). The target research group was consisted of high school students between the age of 15 - 19. There were 3 researches conducted in total and every one of it was carried out within the same respondets. The chapter description and interpretation of results provides information about prevalence of specific types of risk behaviour ( the most common type of risk behaviour is usage of alcoholic beverages, truanting and falsification of parent´s signature), reveals relationships between some personality traits and risk activities (impulsiveness, searching for arousal, negative thoughts, state of depression, excitement).