Objective To explore the perception of clinical learning environment,career maturity,and professional identity as well as their associations among 3+2 nursing undergraduates.Method Totally 198 3+2 nursing undergraduate students from two provincial medical colleges in Shandong province were enrolled.Results Mean scores for clinical learning environment,career maturity and professional identity were (3.44 ± 0.54),(3.31 ± 0.37) and (3.63 ± 0.62),respectively.Clinical learning environment and career maturity (P＜0.001) were positivelyassociated with 3+2 nursing undergraduates' professional identity.Conclusions Clinical learning environment,career maturity and professional identity of 3 +2 nursing undergraduates areat a moderate level.Interventions to facilitate clinical learning environments and career maturity will foster the growth of professional identity.