Abstract: Objective: To investigate the correlation between the morphological parameters of anterior cerebral circulation artery and anterior communicating artery aneurysm(AcomAA). Methods: 73 patients with Acom AA were collected as the AcomAA patient group and 85 patients with normal craniocerebral CTA as the control group. Independent sample T-test was used to compare the morphological parameters of anterior cerebral circulation arteries(vessel diameter, vessel diameter ratio and vessel biforking Angle) of the ipsilateral and contralateral AcomAA patients and the control group. Results: ICA diameter on the ipsilateral side of AcomAA patients was greater than that on the contralateral side and average ICA diameter on the control group(P=0.005, P<0.001). There was no statistical significance between the contralateral ICA diameter of AcomAA patients and the mean ICA diameter of the control group(P=0.084). The ipadal A1 diameter of AcomAA patients was larger than the contralateral A1 diameter and the average A1 diameter of the control group(P<0.001, P=0.002). The contralateral A1 diameter of Acom AA patients was smaller than the average A1 diameter of the control group(P<0.001). There was no statistically significant difference between the ipsilateral and contralateral M1 diameers of AcomAA patients and the average M1 diameers of the control group(P=0.657, P=0.567). ICA/A1 ratio on the contralateral side of AcomAA patients was higher than the average ICA/A1 ratio on the ipsilateral side and control group(P<0.001, P<0.001). There was no statistically significant difference in ICA/A1 ratio between the ipilateral AcomAA patients and the mean ICA/A1 ratio in the control group(P=0.958). The ipilateral A1/A2 ratio of AcomAA patients was higher than the contralateral A1/A2 ratio and the average A1/A2 ratio of the control group(P<0.001, P<0.001). The contralateral A1/A2 ratio of AcomAA patients was lower than the average A1/A2 ratio of the control group(P<0.001). The ipsilateral A1-A2 bifurcation Angle of the Acom AA patient group was the smallest(90.80 ±19.98), and the average Angle of the control group was the largest(115.58 ±17.41),and pairwise comparison showed statistical differences(P<0.001, P<0.001, P=0.042). Conclusion: The morphology of anterior cerebral circulation artery may be correlated with AcomAA.