AIM:Using MRI quantitative data analysis to study the vascularization of scleral cap-style of hydroxyapatite(HA) orbital implant on the basis of past research, and to evaluate the superiority of this operation.METHODS:Retrospectively analyzed the MRI manifestation of 26 cases of intraorbital HA orbital implantation. MRI (plain and enhanced) examination were performed at least once in 1-10 months after operation, and calculated the ratio of MRI(V_E/V_HA). V_E is the volume of enhanced area of orbital implant,and V_HAis the volume of orbital implant.RESULTS:No surgical complications occurred in the 26 cases of intraorbital HA orbital implantation, with 3 cases collected after 1 month, 5 cases after 2 months, 5 cases after 3 months, 7 cases after 4 months, and 6 cases after 5-10 months. Statistic processing shows that vascularization was obvious in the previous 5 months, but unchanged 5 months later.CONCLUSION:Enhanced MRI can precisely and quantitatively observe the degree and range of vascularization of orbital implant, the fully vascularization time of scleral cap-style of HA orbital implant is 5 months after operation.