Objective: To measure the equity of CT and MR allocation in China based on population distribution，and to provide references for optimizing the large medical equipment allocation planning and management policy. Methods: Data on population and allocation of CT and MR in 2017 and 2020 in China were collected，and the equity of CT and MR allocation in China was quantitatively analyzed by Gini coefficient. The equity and its contribution rate between regions and within regions were measured by Thiel index. Results: By the end of 2020，the allocation of CT and MR equipment per million population had reached to 6.57 and 7.55 respectively in China. The Gini coefficients of CT and MR allocation in various provinces and municipalities in China had decreased from 0.224 and 0.161 in 2017 to 0.165 and 0.132 in 2020，respectively，which showed that the allocation equity was pretty good and had been improved. In 2020，the Thiel index of CT and MR within regions accounted for 91.1 %and 87.6 %of the overall Thiel index，respectively. Moreover，the allocation disparity within eastern region was higher than that in the central and western counterparts. Conclusion: The number of CT and MR equipment in China continues to grow，and the equipment allocation is fairly fair. The policy mode of allocation planning and configuration licensing management is helpful to improve the equity of large medical equipment allocation. The disparity in equipment allocation within regions is the main factor affecting the overall equity.