An operation mechanism for Romanian blind includes a Roman blind made up of a blind body of a proper length and width securely attached to the underside of a telescopic upper beam wherein the blind body is equidistantly doubled up for a certain length from top to bottom and sewed up at one side thereof to form a plurality of elongated through holes for horizontal rods to be led and retained therein respectively. At both lateral sides of each elongated through hole are respectively disposed a retaining piece having a C-shaped clamping part detachably mounted at a preset position of the elongated through hole thereon, and a cord-passage hole protruding in vertical position relative to that of the C-shaped clamping part thereof for a pull cord suspending downwards from the upper beam to be led there-through and fixedly tied up to the bottommost cord-passage hole for location thereby. Thus, separately set from the elongated through holes of the blind body thereof, the retaining pieces can be precisely located onto the elongated through holes to clamp tight the horizontal rods retained therein after the blind body along with the horizontal rods thereof are properly trimmed in width according the telescopic upper beam adjusted to fit to the size of a window frame so that the pull cord can be properly held in place according to the adjustment of the retaining pieces to maintain the overall beauty of the blind body in display, increasing the variable changes in decoration and assembly of the present invention to achieve widespread use and boost the competitive power thereof.
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