Answer: Installation method and application scope of grid: (1) High-altitude bulk method: it is suitable for all kinds of grid connected by bolts, and cantilever construction method with less support should be adopted; (2) Strip or block installation method: it is suitable for grid structures with little change in stiffness and stress after division, such as bidirectional orthogonal quadrangular pyramids and forward evacuated quadrangular pyramids; The size of the strip or block should be determined according to the lifting capacity; (3) High-altitude gliding method: it is suitable for quadrangular pyramids, quadrangular pyramids evacuated from quadrangular pyramids and quadrangular pyramids orthogonal to each other. When sliding, the sliding element should be a geometrically invariant system; (4) Integral hoisting method: it is suitable for all kinds of grid structures, and can be translated at high altitude or rotated in situ during hoisting; (5) Integral lifting method: it is suitable for spatial trusses with peripheral support and multi-point support, and can be constructed by small machinery such as elevators and hydraulic jacks; (6) Integral jack-up method: it is suitable for multi-point supported space grids with fewer fulcrum points; (7) When the installation method of hoisting or lifting jack-up is adopted, the following factors should be considered in the selection of the position and quantity of hoisting points: 1) It should be close to the stress state of the grid structure when used; 2) The maximum reaction force of lifting point should not be greater than the bearing capacity of lifting equipment; 3) The load of each lifting equipment should be close.