By　introducing　layer　assignment　algorithm,　it　can　effectively　optimize　multiple　important　indicators　such　as　delay　and　via　counts　in　physical　design,　and　then　improve　the　chip　performance.　Therefore,　a　delay　optimization　layer　assignment　algorithm　integrating　multiple　strategies　is　proposed,　which　considers　both　non-default-rule　wire　and　coupling　effect.　First,　aiming　at　the　problem　that　the　difference　of　nets　is　not　carefully　considered　in　the　previous　work,　the　differentiated　net　strategy　is　proposed.　Second,　in　order　to　solve　the　problem　of　unreasonable　evaluation　of　grid　edge　congestion　in　previous　work,　the　segment　classifying　strategy　is　proposed.　Third,　aiming　at　the　problem　that　the　existing　work　pays　more　attention　to　consider　congestion　constraint　when　reassigning　illegal　nets,　which　leads　to　high　delay　of　routing　results,　an　effective　reassignment　and　adjustment　strategy　is　proposed.　Finally,　aiming　at　the　problem　of　unreasonable　routing　order　in　the　previous　work,　a　variety　of　novel　methods　to　determine　the　routing　order　are　designed,　and　then　a　multi-objective　driven　sorting　strategy　is　proposed.　The　algorithm　runs　in　the　Linux　environment　with　a　2.60　GHz　CPU　and　64　GB　of　RAM.　The　validation　experiments　use　the　DAC12　circuit,　and　the　experimental　results　show　that　the　proposed　algorithm　can　effectively　optimize　both　delay　and　via　counts　without　overflow.　©　2024　Institute　of　Computing　Technology.　All　rights　reserved.