Abstract: A cord locking assembly mounted in the blind head box or the blind hand grip axially movably fitted on the hollow pole suspended from the blind head box.The assembly comprises a movable plug, a fixed plug hole sleeve for fitting engagement with the plug, a lock compression spring to bias the plug to the plug hole sleeve, lift cords passing through the plug hole sleeve, and means for loosening the lock compression spring. The means is the hand grip in the case of the assembly mounted the hand grip. The means is a knob or pull cord fixed to a holder in which the lock compression spring is mounted in the case the assembly mounted in the blind head box.