A　new　weak　link　determination　indicator　of　power　system　is　proposed　and　a　multi-objective　function　reactive　power　optimization　method　oriented　to　system　weak　link　analysis　is　proposed.　The　characteristics　and　advantages　of　both　voltage　and　power　aspects　of　the　weakness　indicator　are　fused.　A　new　weak　link　compounding　margin　determination　indicator　is　defined，which　comprehensively　describes　the　distance　between　the　load　normal　operating　point　and　the　voltage　collapse　point.　This　indicator　can　be　used　as　the　determination　criterion　to　identify　the　voltage　weak　link　point　set　of　system，which　constitutes　the　set　of　nodes　to　be　compensated　for　reactive　power　optimization.　A　multi-objective　reactive　power　optimization　model　is　established，and　an　improved　adaptive　genetic　algorithm　is　used　to　replace　the　traditional　roulette　wheel　method　with　deterministic　selection　principle　in　the　algorithm　selection　process，and　then　the　multi-objective　reactive　power　optimization　model　is　solved.　Taking　the　IEEE　30-bus　system　and　the　New　England　IEEE　39-bus　system　as　simulative　testing　cases，by　comparing　several　system　operation　indicators　and　the　calculative　results　of　traditional　method，the　efficiency　and　superiority　of　reactive　power　optimization　strategy　according　to　the　new　weak　link　determination　indicator　is　verified，as　well　as　the　high　efficiency　of　the　improved　adaptive　genetic　algorithm　in　the　multi-objective　reactive　power　optimization　calculation　is　verified.　©　2024　Electric　Power　Automation　Equipment　Press.　All　rights　reserved.