A femoral prosthesis, comprising a condyle surface for contacting a tibial joint surface; the condyle surface having a first surface section for contacting the tibial joint surface in a range of a first flexion angle, and a second surface section for contacting the tibial joint surface in a range of a second flexion angle; the range of the first flexion angle is from a first flexion angle (θ1) to a second flexion angle (θ2); the range of the second flexion angle is from the second flexion angle (θ2) to a third flexion angle (θ3); wherein the first flexion angle (θ1) is in a range of -20° to 0°, the second flexion angle (θ2) is in a range of 45° to 75°, the third flexion angle (θ3) is in a range of 50° to 90°, the third flexion angle (θ3) is greater than the second flexion angle (θ2); a first curvature radius of the first surface section in a sagittal plane having the same length, and the length of a curvature radius of the second surface section in the sagittal plane decreasing from the front end to the rear end; wherein the second surface section comprises a plurality of curved surfaces in which the curvature radius in the sagittal plane decreasing sequentially from the front end to the rear end; characterized in that a curvature radius of a curved surface at the rear end of the second surface section is a second curvature radius, the second curvature radius is the smallest curvature radius of the second surface section, and: a ratio of the first curvature radius to the second curvature radius is 1.5-1.9; wherein a difference between curvature radii of any two adjacent curved surfaces in the sagittal plane is not greater than 1 mm. the condyle surface having a first surface section for contacting the tibial joint surface in a range of a first flexion angle, and a second surface section for contacting the tibial joint surface in a range of a second flexion angle; the range of the first flexion angle is from a first flexion angle (θ1) to a second flexion angle (θ2); the range of the second flexion angle is from the second flexion angle (θ2) to a third flexion angle (θ3); wherein the first flexion angle (θ1) is in a range of -20° to 0°, the second flexion angle (θ2) is in a range of 45° to 75°, the third flexion angle (θ3) is in a range of 50° to 90°, the third flexion angle (θ3) is greater than the second flexion angle (θ2); a first curvature radius of the first surface section in a sagittal plane having the same length, and the length of a curvature radius of the second surface section in the sagittal plane decreasing from the front end to the rear end; wherein the second surface section comprises a plurality of curved surfaces in which the curvature radius in the sagittal plane decreasing sequentially from the front end to the rear end; characterized in that a curvature radius of a curved surface at the rear end of the second surface section is a second curvature radius, the second curvature radius is the smallest curvature radius of the second surface section, and: a ratio of the first curvature radius to the second curvature radius is 1.5-1.9; wherein a difference between curvature radii of any two adjacent curved surfaces in the sagittal plane is not greater than 1 mm. a ratio of the first curvature radius to the second curvature radius is 1.5-1.9; wherein a difference between curvature radii of any two adjacent curved surfaces in the sagittal plane is not greater than 1 mm.