Objective: To investigate the pathological classification and iconography of meningiomas.Methods: We retrospectively studied the pathological section and imaging features of 295 cases meningiomas which were corroborative by pathological diagnosis.Results: The WHO grade Ⅰ meningiomas were 255 cases,grade Ⅱ meningiomas were 34 cases and grade Ⅲ were 6 cases.Imaging manifestations:The mean diameter of WHO grade Ⅰ,Ⅱ and Ⅲ meningiomas were 4.2 cm,4.5 cm and 4.6 cm respectively.The shapes of WHO grade I meningiomas were predominantly rounded.The rate of lobular shape of WHO grade Ⅱ meningiomas was higher than that of WHO grade Ⅰ meningiomas.While most of the shapes of WHO grade Ⅲ meningiomas was lobular.There were 23.9% WHO grade Ⅰ,55.8% WHO grade Ⅱ and 100% WHO grade Ⅲ meningiomas with unclear boundaries.Dural tail could be found in about 67.8% WHO grade Ⅰ,55.9% WHO grade Ⅱ and 66.6% WHO grade Ⅲ meningiomas.WHO grade Ⅰ,Ⅱ and Ⅲ meningiomas had various invasion of peripheral tissue.During the 2-5 years follow-up,8 cases were recurrence in the total 152 cases.Conclusions: Most of these meningiomas are grade I which included the common fibrous meningioma,meningothelial meningioma and transitional meningioma,and the rare type of secretory meningioma,microcysticm meningioma,metaplastic meningioma,lymphoplasmacyte-rich meningioma.The majority of grade Ⅱ meningiomas are atypical meningioma,the few are clear cell meningioma and chordoid meningioma.The grade Ⅲ meningiomas are rare which showed a malignant growth pattern and have obvious mitosis and necrosis.There is no significant difference in tumor diameter and dural tail.The rates of lobular shape and unclear boundary of WHO grade Ⅱ and Ⅲ meningiomas are higher than that of WHO grade Ⅰ meningiomas.Most of the tumors show invasive growth among the grade Ⅰ、Ⅱ、Ⅲ.The postoperative recurrence rate is related to meningioma grading.