How　to　discover　information　and　knowledge　about　economy　and　business　accurately　from　Internet　is　becoming　more　and　more　important　for　enterprises　today.　In　order　to　discover　information　and　knowledge　accurately　and　improve　the　efficiency　of　general　search　engines　which　focused　on　some　topics　such　as　economy　and　business,　we　design　and　implement　an　efficient　topic-focused　web　search　engine　which　is　able　to　satisfy　users＇　demands　of　web　information　in　specialized　fields　based　on　Multi-Agent　System.