Theory　of　ecosystem　health　assessment　is　introduced　into　the　urban　function　zoning　research.　The　indicators　which　could　reflect　not　only　the　feature　of　ecosystem　health　but　also　urban　function　of　Tangshan　central　area　are　selected　to　analyze　the　suitable　human　activities　characteristics　for　each　urban　unit.　The　criteria　for　analysis　about　proper　human　activities　and　ecological　impacts　of　proposed　urban　functions　are　defined　to　be　a　dataset.　A　programme　which　could　quantify　the　conformity　between　indicators　of　each　unit　and　urban　function　characteristics　is　developed　to　sequence　the　proper　urban　function　for　each　urban　unit.　It　suggests　that　the　basic　functions　of　urban　units　include　eco-preservation,　housing,　information,　financial　industry,　culture　and　education:　The　development-functions　are　varied　among　the　urban　units　due　to　their　ecological　characteristics.　The　main　development-functions　are　business　service,　tourism,　microelectronic　industry,　electronic　equipment　manufacturing,　storage　industry,　agriculture,　machinery,　processing　industry　and　chemical　industry.　The　results　can　provide　useful　information　for　decision-making　during　the　ecological　city　construction.