Objective To summarize the features of multislice spiral computed tomography (MSCT) examination of gastrointestinal stromal tumors (GISTs),and investigate the relationship between predictors and risk of MSCT examination for GISTs.Methods The clinical data of 110 patients with GISTs who were admitted to the Tianjin Medical University Cancer Institute and Hospital from July 2011 to February 2014 were retrospectively analyzed.All the patients received 64-slices spiral CT (64S-SCT) or 16-slices spiral CT (16S-SCT) scan,and the data were transported to the PACS work station for multiplanar reconstruction.All the tumor samples were collected during operation and diagnosed by morphological manifestation and immunohistochemistry of tumors.Very low,low,and medium risk of GISTs were regarded as lower risk grade,and high risk of GISTs as high risk grade.The univariate analysis and multivariate analysis about features of imaging and risk were done by chi-square test and multivariate logistic regression model.Results Tumors located at the stomach in 81 cases,small intestines in 26 cases and colorectum in 3 cases.Diameter of tumors was 0.8-25.0 cm.Smaller tumors were in round or oval shape with well demarcated boundary,and larger tumors were irregular with unclear boundary.Endo-luminal growth of lessions was detected in 25 cases,duplex growth in 35 cases and extra-luminal growth in 50 cases.Enhanced CT scan showed that most of tumors in 105 patients demostrated moderate and high enhancement,heterogeneous enhancement in 74 cases,low density sacvariable necrosis area without enhancement in 60 cases and superficial,cracked-like and deep ulcer without calcification,metastasis and ascites in 23 cases.According to the features of GISTs by MSCT examination,location of tumor,diameter,shape,boundary,growth,enhancement,cystic necrosis,ulcer and metastasis were risk factors affecting risk classification of tumors by univariate analysis (x2=7.442,49.966,31.513,46.038,13.836,16.626,23.489,8.280,6.811,P ＜0.05).Diameter of tumor more than 10 cm and ulcer were independent risk factors affecting risk classification of tumors by multivariate analysis (OR =9.927,0.070 ; 95％ confidence intewal:1.888-52.180,0.012-0.398,P ＜ 0.05).Conclusion There is a characterization in the location,diameter,shape,boundary of tumor,growth,enhancement,cystic necrosis,ulcer and metastasis,and diameter of tumor more than 10cm and ulcer are independent risk factors affecting the risk classification of GISTs.