Abstract: The present invention related to an installation structure for illuminating pen, which is an melioration to the conventional pens. A press section is fixed on top of the pen which controlling the extrusion and retraction of the refill. A flexible handling section is designed at the bottom section of the pen, such easy-gripped design gives compatible handling moderation. The characteristic of present invention is where the pen is fixes with a build-in illuminant, the fixture will then liberates the illuminant continually by pressing the press section hence such invention does not only fit the stationary purpose design, but also bring in new-day leading fashion ideas.