PURPOSE: A forming method is provided to press-form at a high forming speed while maintaining the horizon of a slide plate. CONSTITUTION: Loads to each driving source of each displacement are calculated while press-forming a work by displacing a slide plate(1). Compensation speed of each driving source to prevent the delay of the driving source against a reference driving source is calculated based on a function to show the delay from an indicate displacement through the speed and the loads by using the loads of each displacement and a forming target speed of one driving source(2). The work is pre-formed by moving each driving source based on the compensation speed(3). The delay of each driving source is measured during the pre-forming(4). The pre-forming is repeated by correcting the compensation speed(6) until the delay of other driving source against the reference driving source is under a certain value(5). The formal press forming is performed at the decided speed when the delay is under the certain value(7). Thereby, the forming is performed in a short time while maintaining the slide plate horizontally.