Abstract:Objective：Explore the distribution and features of patients who stay more than 30 days in hospital，find risk factors，and give administrative suggestions. Methods：Based on 190，793 pieces of data extracted from inpatients discharged from a certain grade A tertiary hospital from 2019 to 2020，create 2 groups（≦30 days v.s >30 days），compare the distribution of gender、age、DRG therapy category、relative weight（RW）、total cost and daily cost between the 2 groups，combine with single factor analysis and logistic regression，to find ways to decrease days of hospitalization. Results：Days of hospitalization between the 2 groups are heavily right-tailed，gender、age、DRG therapy category、RW、total cost and daily cost are significantly different between the 2 groups（P < 0.001），male、elder and bigger RW will increase the risk of more than 30 days hospitalization，compared with operation group，patients in surgery group and internal group are more likely to stay more than 30 days. Conclusion：The hospital should spend more time in setting up a better hierarchical medical system、promoting outpatient chemotherapy and radiotherapy，and pay attention to patient communication，unite Health Commission and relative departments to increase the efficiency of medical resource and promote people’s health condition.