This　paper　proposes　a　delay　driven　layer　assignment　algorithm　which　selects　the　routing　layer　by　setting　a　wire　segment　deployment　mechanism.　The　proposed　algorithm　mainly　includes　an　improved　segment　weighting　strategy　and　a　via　constraint　strategy.　The　proposed　algorithm　could　reduce　via　count　while　optimizing　delay,　and　provide　a　better　global　routing　result　for　guiding　the　following　detail　routing.　©　2021　IEEE.