Adsorbent rate for material is 15%. It is concluded that 1 ton of adsorption agent can adsorb 150kg of organic waste gas (It can absorb the waste gas quantity produce by 172 tons of casting); This particle adsorbent is not reused,the price is 10000~15000CNY/ton. Power of diluted fan is 3KW,1 KWH calculated by 1 CNY,adsorbing 20 minutes each time, power consumption of fan is 1CNY to produce one ton of castings.