This study aims to explore the socialization issues of new-coming professional engineers. Based on theory socialization, social learning theory and social information processing approach, this study attempts to introduce work group socialization (group level) and self socialization (individual level), i.e., information seeking behavior, to the research model simultaneously. It is to improve the inconsistency between theories and empirical studies, and further to provide integral perspective on newcomer¡¦s socialization issues. Therefore, this study applies cross-level research design to explore and analyze relationships among socialization tactics at group and individual level, role breath self-efficacy and role performance. Collecting data from 91 groups, which include 91 immediate supervisors and 384 new-coming professional engineers, the research draws conclusion in two dimensions: (1) information seeking behavior, role breath self-efficacy, and role performance relationships at individual level; (2) socialization tactics, role breath self-efficacy and role performance relationships at cross-level. At the individual level, the results show that (1) when individuals apply overt, third party, and observation as the information seeking behaviors, there is a positive effect on role performance; when apply indirect and test as the information seeking behaviors, there is a negative effect on role performance. (2) When individuals apply ¡§overt¡¨, ¡§third party¡¨, and ¡§observation¡¨ as the information seeking behaviors, there is a positive effect on role breath self-efficacy; when apply ¡§indirect¡¨ and ¡§test¡¨ as the information seeking behaviors, there is a negative effect on role breath self-efficacy. (3) When individuals have high level of role breath self-efficacy, they are more willing to undertake tasks beyond work requirement, and thus have significant increase in role performance. (4) Role breath self-efficacy has full mediating effect on the relationship between overt, indirect, third party, test and role performance, and it has partial mediating effect on the relationship between observation and role performance. At the cross-level, it is found that (1) when the groups adopt ¡§investiture¡¨ and ¡§sequential¡¨ socialization tactics, the individual¡¦s role performance is positively increased; when the groups adopt ¡§collective¡¨, ¡§formal¡¨, ¡§serial¡¨ and ¡§fixed¡¨ socialization tactics, there is no significant influence on individual¡¦s role performance. (2) The level of groups¡¦ ¡§collective tactic¡¨ has negative moderating effect on the relationship between individual¡¦s ¡§third party¡¨ information seeking behavior and role breadth self-efficacy; ¡§sequential tactic¡¨ has positive moderating effects on the relationship between third-party information seeking behavior and role breadth self-efficacy; ¡§formal tactic¡¨ has negative moderating effect on the relationship between ¡§testing¡¨ information seeking behavior and role breadth self-efficacy; sequential tactic and fixed tactic have negative moderating effect on the relationship between observation information seeking behavior and role breadth self-efficacy; and serial tactic have positive moderating effect on the relationship between observation information seeking behavior and role breadth self-efficacy. (3) Each socialization tactic does not have direct contextual effect on role breath self-efficacy, while role breath self-efficacy also does not have mediating effect on the relationship between socialization tactics and role performance.

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