Abstract: Two common coldrolling processes of grain oriented silicon steel and the effects of the single stage cold rolling and twostage cold rolling with intermediate annealing processes on the primary recrystallization microstructure and texture were investigated. The results revealed that for the grain oriented silicon steel prepared under the twostage cold rolling process with intermediate annealing with Cu2S as the main inhibitor， the average grain size of the primary recrystallization microstructure was 181μm，the volume fraction of Goss grain was 06%， the ratio of coincidence site lattice(CSL，Σ 5+ Σ 9)and high energy grain boundaries(20~45° misorientation angles)which have the higher migration than the conventional boundaries were 18% and 504%， respectively. Compared with the single stage cold rolling process， the primary recrystallization grains of the twostage cold rolling with intermediate annealing were finer; moreover， the proportion of Goss grain and high migration boundaries were larger， which were favorable to the secondary recrystallization occurrence of the Goss grain.

Key words: grain oriented silicon steel, cold rolling process, primary recrystallization, texture, grain boundary