Abstract: Objective To explore the effect of minimally invasive drainage and urokinase injection on chronic subdural hematoma.Methods 118 patients have been treated with needle puncturing into hematoma since 2003.Among them,52 patients were only drained after puncture,since 2007,other 66 patients were injected urokinase into hematoma for one to third times after puncture.Results The average time of hematoma complete drainage for 66 patients who accepted urokinase injection into hematoma was 4.1 days,and no recurrence...