Up　to　now,　there　is　the　complete　blank　in　the　field　of　evaluation　of　full　grain　catalyzer　in　minitype　evaluation　in　China.　According　to　the　condition　of　the　evaluation　system,　it　gives　a　control　algorithm　based　on　cascade　control,　and　outside　gives　fuzzy　control　algorithm,　inside　gives　PID　control　algorithm.　Then　the　control　precision　can　be　improved　and　it　is　easy　to　realize　in　DCS　system.　This　algorithm　does　not　depend　on　the　precision　math　model　of　undercontrolled　object.　It　not　only　improves　the　control　precision　of　system　but　also　overcomes　the　effect　to　the　stability　of　control　system　brought　by　time-delay.　Then　this　algorithm　solves　the　difficulty　in　the　normal　control　algorithm　such　as　the　need　of　precise　math　model,　difficulty　to　stable.