To　reduce　conflicts　of　branch　line　traffic　flow　and　trunk　road　traffic　flow　in　urban　traffic　networks,　a　region　coordination　fuzzy　control　algorithm　is　proposed　in　this　paper.　It　is　based　on　the　control　theory　of　classification　and　coordination　of　the　system　engineering.　In　the　paper　the　design　idea　of　coordination　control　and　the　control　structure　is　introduced　with　emphasis.　The　algorithm　simulation　has　been　carried　out　through　microscopic　transportation　simulation　software　Paramics　and　the　result　indicates　that　the　region　coordination　fuzzy　control　algorithm　can　effectively　scatter　the　traffic　in　urban　traffic　networks.　Thus,　it　has　confirmed　the　feasibility　that　this　algorithm　can　apply　to　controlling　the　traffic　flows　in　urban　traffic　networks.