The invention relates to the technical field of building decoration and discloses an installation structure. The installation structure comprises a transmission piece, a transmission rod and a sectionbar, wherein the transmission piece is a conversion rod or a locking rod or an angle driver, the transmission rod is arranged in a groove of the section bar, the transmission piece is installed in the groove of the section bar through a clamping assembly, the clamping assembly comprises a base, a rotating piece and an elastic piece, and the base is provided with an accommodating groove and a first boss; the rotating piece is arranged in the accommodating groove and is rotatably connected with the base, the rotating piece comprises a clamping sheet, and when the rotating piece rotates, the twoends of the clamping sheet can extend out of the accommodating groove to be clamped with the groove of the section bar, one end of the elastic piece along the length direction of the elastic piece isarranged on the first boss, and the other end of the elastic piece can abut against the side surface of the clamping sheet so as to limit the rotation of the clamping sheet. The installation structure is convenient to operate, simple in structure, high in installation efficiency, stable in structure, free of slot punching and accurate calculation of the length of the transmission rod, and large in error allowable range.