Considering superheated steam temperature is a thermal object with large inertial and big-lagged characteristics， a new steam temperature control strategy for utility boiler based on the internal model control principle is proposed. This control strategy is successfully applied to 670 t/h super-pressure boiler of No.6 Unit in Xuzhou Power Plant. Process of commissioning and performance of unit operating indicates that this new control strategy has the features of simple structure， limited on-line tuning parameters and fine performance in robustness and anti-interference. On-site test shows that the new control strategy is superior to the conventional PID cascade control strategy in control quality under the conditions of either stable process or dynamic process.