Abstract: A position controlling system is utilized to be externally connected to a manual hydraulic positioning machine. The position controlling system includes an operation interface, a position sensing assembly, and a control module. The operation interface is operated to define a target position. The position sensing assembly is utilized to sense a current position of a platform assembly of the manual hydraulic positioning machine. The controlling module is utilized to control a pressure-increasing unit and a pressure-releasing unit of the manual hydraulic positioning machine to reduce an overshoot of the platform assembly.