The invention discloses a 9*9 square plane four-corner-point bearing net frame.100 joints are evenly arranged on an upper chord of the net frame, and rod pieces are connected to the adjacent joints in the horizontal direction and the vertical direction.The middle of the structure of a lower chord of the net frame is square, the outer side of the lower chord is in a # shape, the periphery of the lower chord is closed, and lower chord rods are connected to four corner points of the lower chord and corners of the square structure.Four web members are connected between all the lower chord joints and the adjacent upper chord joints.According to the 9*9 square plane four-corner-point bearing net frame, the total number of all rods of the net frame is obviously smaller than the number of rods of a net frame form provided by the present regulation; compared with the same-type structural forms such as the square pyramid net frame, the normally placed pyramid net frame and the chessboard square pyramid net frame, the bearing force and the robustness of the structure are equivalent or better, the steel use amount can be saved by 10% or above, and the 9*9 square plane four-corner-point bearing net frame has the obvious social benefits and the economic benefits.