Objective To investigate the risk factors of symptomatic cerebral vasospasm (SCVS) after craniocerebral trauma. Method The clinical data of 308 patients with craniocerehral trauma were analyzed by single factor analysis and Logistic regression analysis. Resnlts SCVS occurred in 94 patients (30.52%). The risk factors were subarachnoid hemorrhage (SAH), Glasgow coma scale, blood glucose, emergency operation,smoking and age. Conclusions Various factors are related to the development of SCVS after craniocerebral trauma. Prophylactic treatments should be given in early stage for the patients with risk factors.