Objective:To analyze the diagnostic value of multimodal magnetic resonance imaging(MRI)in grading and Sub-type of meningiomas.Methods:A total of 98 patients with meningiomas were reviewed.They were divided into benign group(n=78)and malignant group(n=20)according to the pathological examination results.All of them underwent conventional MRI scan and mul-timodal MRI examination upon admission.The multimodal MRI parameters[apparent diffusion coefficient(ADC),local cerebral blood flow(rCBF),magnetic sensitive signal intensity(ITSS),N-acetylaspartate(NAA)/choline(Cho),NAA/creatine(Cr),Cho/Cr]of patients with benign and malignant meningiomas,and patients with different subtypes of benign meningiomas were compared.The diag-nostic value of multimodal MRI for meningioma classification and grading were analyzed by receiver operating characteristic(ROC)curves.Results:The ADC,NAA/Cho ratio and NAA/Cr ratio of meningiomas in the malignant group were lower than those in the be-nign group(P＜0.05).The rCBF,ITSS and Cho/Cr ratio were higher than those in the benign group(P＜0.05).The AUC values of three-dimensional arterial spin labeling(3D-ASL),diffusion-weighted imaging(DWI),susceptibility-weighted imaging(SWI)and proton magnetic resonance spectroscopy(1 H-MRS)for grading of meningiomas were 0.723,0.735,0.777 and 0.870.The AUC of com-bined diagnosis was 0.957.There were significant differences in rCBF,ITSS,NAA/Cho ratio,NAA/Cr ratio and Cho/Cr ratio among patients with different subtypes of benign meningiomas(P＜0.05).Conclusion:Multimodal MRI is helpful in clinical grading and Subtype of meningiomas.