Abstract:〔Abstract〕 Objective The clinical application and evaluation of 3D printed individualized osteotomy guide plate in total knee arthroplasty (TKA). Methods 30 patients with knee osteoarthritis requiring unilateral TKA were selected from the First People's Hospital of Foshan from March 2020 to December 2020 were divided into control group and observation group, with 15 cases in each group. Among them, the control group was treated with traditional TKA, and the observation group was treated with TKA assisted by individualized osteotomy guide plate based on 3D printing technology. All 30 patients successfully completed the operation and were followed up for at least two months. The incidence of complications, operation time, intraoperative bleeding and postoperative drainage were compared between the two groups. The knee function was evaluated by the knee score standard of American hospital for special surgery (HSS) knee score before operation, one week and two months after operation. Results The operation time, intraoperative bleeding and postoperative drainage volume of the observation group were significantly lower than those of the control group (P < 0.001). One week and two months after operation, the HSS score of the observation group was significantly higher than that of the control group (P < 0.001). There were no complications such as fracture, knee varus deformity, joint dislocation, prosthesis loosening, joint infection and so on. Conclusion Compared with traditional TKA treatment, 3D printing individualized bone interception guide plate assisted TKA operation is easier, which can effectively shorten the operation time, reduce the damage of surgery, reduce bleeding, which is conducive to the functional rehabilitation of the knee joint.