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The function of excited signal, in the generation, transmission and extraction process of measuring signal in the piezomagnetic type shape meter, was particularly analyzed, and its importance of signal quality to measuring accuracy of stripe shape was showed clearly. Aimming to the various disadvantages of traditional methodes on generating excited signal, a new method based on microcontroller was proposed. Following the method given, a exciting power system for the shape meter appling to the 1250 HC cold rolling mill of ANSHAN IRON AND STEEL GROUP CORPORATION was developmented. Industrial operation shows this exciting power system can provide the current-collecting device of shape meter and signal processing system with high-quality excited signals. The distortion degree of measuring signal is greatly reduced in the process of transmission and extraction, sequentially, the measuring accuracy of stripe shape is significantly improved. This method offers a new way for exciting circuit design, and has much reference to produt design relating to excited signal.