The invention discloses a fixing piece and a use method thereof. The fixing piece comprises a base body, a convex buckle and multiple groups of fixing claws, wherein the base body is made of a flexible material and is provided with a plurality of through holes distributed in the extending direction of the base body; the convex buckle is arranged on the base body and is buckled with the corresponding through hole in the base body; each group of fixing claws comprises a first claw body and a second claw body which are oppositely arranged; and the first claw bodies and the second claw bodies aremade of flexible materials, the first ends of the first claw bodies and the second claw bodies are connected with the two opposite side parts of the base body in the extending direction of the base body respectively, the second ends of the first claw bodies and the second claw bodies are in a free state, and an accommodating space is formed among the first claw bodies, the second claw bodies and the base body. According to the fixing piece, a clothes support can be fixed on a clothes airing rod, so that aired clothes are fixed and a good airing effect is achieved; and the convex buckle can beadjusted to be buckled with the appropriate through hole according to the thickness of the clothes airing rod, so that the fixing piece is suitable for various clothes airing rods with different thicknesses.