Operation method for dismounting working head from power tool

The invention provides an operation method for mounting and dismounting a working head on and from a power tool. The power tool comprises an output shaft, a fastening piece, a locking piece and a driving piece, wherein the output shaft is used for mounting the working head and driving the working head to work; the fastening piece is used for fixing the working head on the output shaft; the locking piece is used for locking and releasing the working head and moves between the locked position and the released position; and the driving piece is used for being movably arranged on the output shaft. The operation method comprises the following steps: a) pressing the driving piece to drive the locking piece to move so as to release the fastening piece; b) taking out the working head. The operation method has the benefits that an operator is only required to press the driving piece to drive the locking piece to move so as to release the fastening piece, so that the fastening piece can be easily dismounted from the output shaft, and the convenience for operation is improved.