Abstract: An R-N-D control valve of a hydraulic control system is disclosed which ensures the prevention of shock that may occur at the time of an "N-R" and an "N-D" manual shift, by unifying a shift control pressure with one valve in the case of an "N-R" shift and an "N-D" shift and first-second speed shift. The present invention discloses that a line pressure generated from a manual valve is changed to a control pressure controlled by the proportional control of a linear valve, and transmitted to each clutch and brake according to the movement position of a spool of a valve by the line pressure.