In　this　paper,　the　light　source　is　fiber　coupled　semiconductor　laser.　The　lens　system　is　used　to　image　the　image　of　the　fiber　end　face　on　the　heated　object,　and　the　focusing　range　is　6.5-70mm.　Then　the　trajectory　is　optimized　in　the　non-sequential　mode　of　ZEMAX.　The　system　uses　five　lenses　and　uses　a　cam　structure　to　achieve　zoom.　A　laser　homogenizing　zoom　system　with　adjustable　spot　size　in　the　continuous　range　of　12mm-151mm　at　a　distance　of　1.5m　was　designed,　and　the　mechanical　structure　was　designed.　The　system　structure　is　simple,　and　the　uniformity　can　reach　more　than　86　%　in　all　spot　size　ranges.　©　2024　SPIE.