Aimed at the Crossflow fan dynamic balancing problem, an automatic dynamic balance measurement and calibration system was proposed, the measuring principle, the balance strategy choice, the composition and realization process of automatic balance system was introduced. The dynamic balance system built for the Crossflow fan realized the automatic dynamic balance measurement and calibration, and the system was put into actual production use. The results show that the acceptability of crossflow fan is greatly improved, also the good economic benefits is obtained.