Objective To address the problems of loosening of prosthetic screws, insufficient bone integration, and difficulty in reconstructing the function of the lateral pterygoid muscle in traditional temporomandibular joint replacement surgery, based on the theory of "three-dimensional biomechanical fixation" and the integrated concept of "structure function biological compatibility", a three-dimensional fixed porous condyle prosthesis is designed and its mechanical properties are verified. Method Finite element analysis was used to evaluate the biomechanical characteristics of the prosthesis under six conditions:The intercuspal position, incisal clench, left and right unilateral molar clench, and left and right group function. The mechanical properties were verified through in vitro compression experiments. Results The maximum stresses in the solid part and porous area of the prosthesis were 144.77 MPa and 15.79 MPa, respectively, while the maximum stress in the screw was 21.12 MPa (screw # 4); The maximum stress of the cortical bone and trabecular bone of the mandible are 30.0 MPa and 6.29 MPa, respectively, and the maximum strain is 1660με and 2250με, respectively. Mechanical testing has confirmed that the maximum bearing capacity of the prosthesis is (5718.74±795.26) N. Conclusion This study designed and prepared condylar prostheses that optimize mechanical strength, bone integration, and functional reconstruction simultaneously. The stress-strain distribution of these prostheses is uniform, their three-dimensional fixation structure reduces the risk of screw loosening, and their porous design promotes bone integration, providing a quantified reference for structural optimization of domestically produced prostheses.