Background: Theft has leaded to significant costs to commerce and legal system, but its psychological mechanisms and risk factors are barely explored. This study aims to investigate the influence of family structure and adult attachment style on theft behaviors in men. Methods: 257 men with a conviction for theft (theft group) and 405 male college students (control group) were interviewed with Experiences in Close Relationships Scale and a general questionnaire about socio-demographic information, family structure and criminal records. Results: Compared with control group, long-term residency, family economic situation, number of siblings, father’s presence before 5 years old, parents’ state of existence and parents’ marital status of theft group were significantly different (P<0.05). Living in urban area, from relatively poor family, not living with father before 5 years old and parents not divorced increased the likelihood of theft in men (P<0.05). While father not alive and having no siblings decreased the likelihood of theft in men (P<0.05). Then theft group was further divided into first offender group and recidivist group. First offender group had a significantly higher proportion of living with mother/father before 5 years old and father alive than recidivist group (P<0.05). Not living with mother before 5 years old and father not alive increased the possibility of multiple thefts, while preoccupied attachment decreased such possibility (P<0.05). Conclusions: This study suggested that risk factors for theft and multiple thefts were different. A variety of targeted strategies related to family structure and attachment styles are needed to prevent theft from occurring and reoccurring.