The spherical net frame consists of four upper strings forming a square cone bottom, the cone top is located below the center of the square, the four ventral rods are connected to the cone top by the four square corners, which forms a quadrangle cone. Each quadrangle cone is connected according to certain rules, then becomes a quadrangle cone net frame.

Positive quadrangle mesh frame: the bottom side of each quadrangle cone is parallel to the axis of the building, the bottom side of each quadrangle cone is connected to form the upper chord of the mesh frame, the top of each quadrangle cone is connected to form the lower chord parallel to the axis of the building. The length of the upper lower chord of this kind of net frame is equal, stagger one half node to another.

Bevel grid: this grid connects the base Angle Angle of each quadrangle cone. The upper chord (i.e., the base side of the cone) the axis of the building form an Angle of 45°. The lower chord formed by connecting the top of the cone is still parallel to the axis of the building. The length of the upper chord under compression is smaller than that of the lower chord under tension, so the force is more reasonable. The number of rods at each node is less, so less steel is used.

Checkerboard quadrangle net frame: the entire diagonal quadrangle net frame is rotated horizontally at an Angle of 45°, so that the upper chord of the net frame is parallel to the axis of the building, the lower chord is at an Angle of 45° with the axis of the building.

This kind of grid can overcome the shortcomings of many kinds of roof panels the difficulty of roof drainage slope formation.

Star four pyramid space truss: rack unit for a four star pyramid, cross the four pillars of the string to the lower side of the cone, the cross intersection connecting a vertical bar, in the cross of four on the other side of the upper chord to the lower stem connection, form the four CHS, constitute a four star pyramid space truss unit, each unit of the cone top connected to become lower chord.

The mechanical performance stiffness of this kind of truss are relatively good.