To overcome issues in the conventional parallel threedimensional imaging system, such as the smaller threedimensional public scene, none of the horizontal positive parallax resulting in threedimensional reproduction only in front of the screen and causing visual fatigue easily, an improved parallel 3D imaging method was proposed. Based on the portion of the readout pixel array reserved but not used for display in most image sensors, the display array was made a corresponding horizontal offset by reference from offaxis parallel display technology and then fed in 3D display monitor. Through the analysis and derivation in the established mathematical model, the horizontal positive parallax production was realized, so threedimensional reconstruction could be felt behind the screen, and the stereo visual effect was greatly enhanced. The proposed method was proved feasible on the selfdeveloped system of 640×480@120 Hz with selection of the CCD resolutions to 752×582, and the angle of threedimensional public scene could be increased from the conventional 29° to a maximum of 34°. The proposed method provides a new direction for the appropriate design of the positive and negative parallax and for the study on the improvement of the stereo effect.