From　the　standpoint　of　system　control,　some　features　of　wastewater　biological　treatment　processes　were　discussed,　and　according　to　its　characters　of　time-varying,　nonlinearity,　complexity　and　uncertainty　it　was　presented　that　intelligent　control　was　an　effective　method　that　can　be　used　to　achieve　the　automatic　control　of　urban　wastewater　treatment　system.　The　architecture,　composition　and　trait　of　fuzzy　control,　neural　networks　control　and　expert　system,　main　branch　of　intelligent　control,　were　analyzed.　The　applications　of　intelligent　control　technology　in　wastewater　treatment　processes　are　discussed.　The　results　showed　that　intelligent　control　technology　has　been　permeated　into　nearly　all　aspects　of　biological　wastewater　treatment　and　performed　well,　which　testifies　that　application　of　intelligent　control　(IC)　technology　was　an　effective　way　achieving　on　automatic　control　of　wastewater　biological　treatment　system.