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Objective: To observe the configuration of the circle of Willis(CW)and measure the posterior communicating artery(PcomA)in Chinese people,and to provide anatomic basis for studying the blood supply of cerebral artery.Methods:173 cases CTA data of head and neck(without any lesions in the CW and its surrounding structures)were selected from the PACS in our hospital from March 2015 to March 2016,and the 3D images of CW were observation and measurement,including the CW types and diameter of PcomA.CW classification 1 accord to the integrity of CW which was divided into type I as the complete CW,type Ⅱ as the complete anterior circulation of CW and incomplete posterior circulation,type Ⅲ as the incomplete nterior circulation of CW and complete posterior circulation and type IV as anterior and posterior circulation are not complete.CW classification 2 accord to the vascular development of CW which was divided into type I as complete development of CW,type Ⅱ as variant of CW(anomaly branches or traffic of CW),type Ⅲ as developmental dysplasia(part agenesis of CW or its diameter less than 1mm)and type IV as mixed one(with variation and dysplasia).PcomA measurement is from the minimum diameter of PcomA.Results: CW of 173 cases Chinese people,classification 1 found type I is 23.7%(41/173),type Ⅱ 59.5%(103/173),type Ⅲ(4/173)and type IV 14.5%(25/173); classification 1 found types I is 15%(26/173),type Ⅱ 6.4%(11/173),type Ⅲ 67.1%(116/173)and type IV 11.5%(20/173).Bilateral PcomA was showed in 45 cases,with diameter of 128 ± 0.34mm,and the maximum is 1.8mm; the unilateral was showed in 36 cases,with diameter of 1.14 ±0.36 mm,and maximum 2.1mm; bilateral was not showed in 92 cases.The diameter of PcomA is 1.21 ± 0.35mm,it is not significant difference in the PcomA diameter between unilateral and bilateral,as well as between the left and right.Conclusion: CTA can clearly show the configuration of CW,whose most common type is the complete anterior circulation of CW and incomplete posterior circulation or developmental dysplasia in Chinese people.PcomA diameter is about 1-2mm,and the bilateral agenesis of PcomA is 53.18%,which suggests that more than half of Chinese people are the lack of traffic in the anterior and posterior circulation of CW.