Abstract: Objective To explore the hospitalization expenses and its influential factors in schizophrenic inpatients in Tianjin city and to provide evidence for the control of hospitalization cost. Methods A total of 18 182 schizophrenic inpatients with medical insurance from 2003 to 2007 were selected randomly from a hospitalization database and the medical expenses and influencing factors among the patients were analyzed. Results The average total cost for one schizophrenic inpatient were 3014.59±745.31,1 986.94±538.79,2 181.92±503.85,and 3 861.22±738.29 RMB yuan for hospitalization in any hospital,in the hospital of first,second and third grade.The fee of treatment,test,berth,drugs,other,and material accounted for 52.37%,22.60%,15.41%,5.04%,4.31%,and 0.27% of all hospitalization expense,respectively.The results of multi-regression analysis showed that there were positive correlations between age,admission days,grade of the hospital,proportion of treatment fee,material fee and hospitalization expenses.And negative correlations were found between former admission time,berth fee,others fees,and hospitalization expense. Conclusion Age,grade of the hospital,admission days,former admission time,the proportion of treatment,and material fee are key factors for the cost of hospitalization expenses for insured schizophrenic inpatients in Tianjin city.