Abstract: The effects of cold rolling reduction rate on the recrystallization microstructure, texture and magnetic properties of niobium-containing oriented silicon steel were studied by using OM and EBSD techniques. The results show that the size of the primary recrystallized grain gradually decreases after decarburization annealing with the cold rolling reduction increasing. When the cold rolling reduction rate reaches 88%, the grain size becomes more uniform and finer, and the average grain size reaches 26.2 μm; the favorable texture 111＜112＞ and 411＜148＞ content of the decarburized annealed sheet is relatively high. After high temperature annealing, the average grain size of secondary recrystallization reaches 9.8 mm, the Goss texture content is high and the orientation is accurate, and the magnetic properties are more excellent.