Wastewater　treatment　processes　(WWTP)　involve　a　large　number　of　physical,　chemical　and　biological　reactions.　The　concentration　of　Dissolved　oxygen　(DO)　is　an　important　water　quality　parameter　in　WWTP,　so　it　is　necessary　to　control　it.　To　solve　this　difficult　problem,　a　dual　heuristic　programming　(DHP)　controller　based　on　leakage　Echo　State　Network　(LESN)　is　proposed,　which　is　called　LESN-DHP　controller　for　short.　Firstly,　a　neural　network　(NN)　identifier　based　on　LESN　(LESN-Identifier)　is　designed　to　obtain　the　dynamic　characteristics　of　the　system.　Then　the　stability　analysis　and　convergence　analysis　are　carried　out.　Finally,　the　feasibility　of　LESN-DHP　controller　is　verified　by　simulation　experiment.　The　simulation　experiment　proves　that　LESN-DHP　controller　has　better　control　effect　and　better　performance　index　than　other　controllers　in　WWTP.　©　2023　IEEE.