A　cellular　automata　model　(CA)　for　adsorption　and　stabilization　processes　in　wastewater　treatment　was　established　based　on　biological　mechanism　of　activated　sludge　wastewater　treatment　and　the　growth　law　of　the　activated　sludge,　and　simulation　experiment　was　made　using　practice　parameters.　The　results　indicate　that　the　CA　model　well　reappears　the　complex　adsorption　and　stabilization　processes　in　the　bioreactor,　realizes　visual　evolution　processes　and　well　describes　the　removal　rate　of　BOD　in　stabilization　processes　and　the　growth　of　activated　sludge.