Due　to　companies＇　practical　demands　for　information　collection　and　monitoring　around　the　Internet,　this　paper　firstly　proposes　the　architecture　for　a　distributed　environment　scanning　system,　which　is　based　upon　multi-agent.　Meanwhile,　in　order　to　fulfill　the　special　demand　of　repeatedly　gathering　updated　information,　the　classical　min-min　heuristic　scheduling　algorithm　is　assimilated　to　design　the　recycling　task　earliest-finished　scheduling　algorithm.　According　to　the　theory　of　hierarchical　timed　colored　Petri　nets　(HTCP-net),　a　system　scheduling　model　is　built　with　modeling　and　simulation　tools　CPN　tools.　Finally,　the　model　executes　for　simulation　and　demonstrates　the　average　waiting　time　of　tasks　and　the　average　length　of　each　agent　waiting　queue.　Compared　with　the　results　from　simulations　of　cyclic　scheduling　algorithms　and　shortest　waiting　queue　scheduling　algorithms,　it　is　indicated　that　the　scheduling　model　enhances　the　degree　of　organizational　users＇　satisfaction　and　also　meets　the　system　demands　of　periodically　repeated　Web　page　visit.