1. An apparatus detecting reflection images from microarray biochip with sidewall, comprising: a carrier, carrying a plurality of microarray biochips; an optical module, scanning the biochips; and a movable system, carrying the carrier and/or the optical module respectively in a first direction and/or a second direction to achieve relative movement so that all the biochips are scanned; wherein the optical module comprising: at least a white light source, irradiating on the biochips; at least a reflective lens, adjusting a light path of a reflected light from the biochips; at least a linear CCD (Charge Coupled Device), receiving the reflected light to retrieve images from the biochips; and at least a focus lens, focusing the reflected light to the CCD.