Objective To discuss factors related to clinical characteristics,biological behavior,and prognosis in gastric stromal tumors (GST).Methods We retrospectively analyzed clinical materials and records of 70 GST patients diagnosed after surgery and pathological examinations,all patients were contacted by telephone or mail for follow-up.Results (1) All GST patients had similar distribution of gender,and had age range of 50 to 69 years with mean age of 59.1 years.Clinical symptoms were non-specific,and main clinical manifestations included abdominal discomfort (42.9％),followed by abdominal pain (37.1％),and upper digestive tract hemorrhage (7.1％).(2) Sex,age,presenting symptoms,and original location of tumors were not significantly related to prognosis (P ＞ 0.05).However,size of the tumor,mitosis count,and the malignancy potential grading were significantly associated with patient prognosis.Among them,size of the tumor (maximum tumor diameter ＞ 5 cm vs ＜ 2 cm,HR =21.3,95％ CI:5.9-77.0;maximum tumor diameter 2-5 cm vs ＜ 2 cm,HR =2.3,95％ CI:1.2-7.8),and mitosis count (mitosis count ＞ 10/50 HPF vs mitosis count ≤5/50 HPF,HR =22.5,95％ CI:8.6-58.6;6-10/50 HPF vs ≤5/50 HPF,HR =11.1,95％ CI:9.9-12.3) were independently associated with GST prognosis.Conclusions Tumor size,mitosis count,and malignancy potential grading were associated with prognosis of GST.Among them,tumor size and mitosis count were independent predictors of prognosis.When the tumor size is larger,and mitotic count and the malignant potential grade is higher,prognosis of GST patients were worse.