With　the　rapid　development　of　the　new　generation　smart　substations,　how　to　carry　out　a　reasonable　assessment　and　design　defect　warning　for　the　whole　substation　before　construction　is　one　of　the　important　topics　of　attention.　This　paper　proposes　the　software　simulation　technology　for　new　generation　smart　substation　secondary　system.　The　software　simulation　technology　can　simulate　the　communication　behavior　of　MMS/GOOSE　and　the　universal　event　response　mechanism.　The　simulation　system　can　achieve　the　single　device　simulation　verification,　the　bay　operation　simulation　check　and　the　whole　station　operation　simulation　check　of　the　new　generation　smart　substation　secondary　system.　By　simulating　the　action　state　of　the　secondary　system,　the　correctness　and　rationality　of　the　SCD　file　can　be　verified,　and　the　reasonableness　evaluation　and　the　design　defect　warning　of　the　substation　before　construction　can　be　carried　out.　It　greatly　simplifies　the　complexity　of　the　device　and　system　debugging,　and　improves　the　efficiency　of　the　integrated　debugging　of　the　smart　substation　automation　system.　©　2018　IEEE.