Using a digital light processing (DLP) projector and an industrial camera as main hardware platform, developed an integrated prototype system of 3D measurement and positioned indication, namely i-Guider. The working principle and key techniques of i-Guider system were described. A set of sinusoidal phase shift fringes were loaded in the memory of the DLP projector, which was taken as an inverse imaging device. The camera-projector system was calibrated by using a planar board with the aid of structured-light projection. A method was proposed to automatically generate the 2D projecting images of pre-defined 3D indications, such as specific curve features and operation instructions on the CAD model of the workpiece. The projecting images were sent to the projector via HDMI to achieve accurate positioned indications on the real workpiece. A positioned indication experiment on aircraft skin riveting was performed, in which i-Guider system had exhibited excellent performance. Experiments show that the positioned indication error is within 0.25 mm.