The invention provides a handle assembly for faucets, which can be connected with a valve stem (51) of a body assembly extended to pass through a top, the handle assembly is located upon a panel for connection with the body assembly and the top, and comprises a handle part (1), a one-piece wear-resistant bush (2) and a handle base (3); the handle part (1) is provided with a rod (41) and a connecting part (42), and the connecting part (42) is so structured as to be connected with the valve stem (51) and rotate along with the valve stem (51); the one-piece wear-resistant bush (2) is used for being sleeved on at least one part of the connecting part (42) of the handle part, and is provided with a peripheral deformed structure and a positioning structure; the handle base (3) with a top through hole (30) is used for containing the assembled assembly of the connecting part (42) of the handle part (1) and the one-piece wear-resistant bush (2); and the handle base (3) is placed on the panel in a gapless connection manner, so that the handle assembly is connected with the valve stem (51). In addition, the invention also provides a method for mounting the handle assembly.