A control pillar of injection molding machine, which can diminish the increase of cycle time while the screw rod is falling back after be measured, more accuracy and unity numerical magnitude can be obtained, and the condition of measurement can be determined in a short time. After the measuring, screw rod stop circumgyrate and fall back by the first velocity V1. In the enactment zone, the screw rod reverse rotation by the preset velocity Rv. Then, screw rod fall back at he second velocity V2 which is lower than the first velocity V1, While stopped in the reverse rotation zone, screw rod stop circumgyrate and fall back to the enactment stop position by the third velocity V3. Therefore, compared to the circs of screw rod fall back and reverse rotation, cycle time can be shorten. When the screw rod reverse rotation the fall back speed of screw rod is low, which can inhibit the sudden change of drang. as a consequence of adjust the conditional of screw rod reverse rotation and retrogressive autocephaly, it can be adjust to optimum conditions in a short time.