a method to motorize bladeset rotation angle of a shutter including the following steps : resetting the bladeset to an origin point position at first when a start instruction is received , rotating the bladeset to a given target angle with respect to the origin point , and calculating a residual angle deviation to continuously rotate the bladeset to the given target angle when an instruction of the given rotation angle is received again during the operation . further , a device provided to motorize bladeset rotation angle of a shutter includes an input interface for inputting instructions , a sensor for sensing an origin point position of the bladeset , a driver for driving the bladeset to rotate , and a controller for calculating and controlling the operation of the driver according to the origin point position and target angle , such that the bladeset is controlled to be rotated to the required angle .