Abstract: The effects of normalizing treatment on the inhibitor, microstructure, texture and grain boundary characteristics of Fe-3.2%Si-0.055%Nb low temperature grain-oriented silicon steel containing 0.055% Nb were studied by OM and EBSD techniques. The results show that the structure of the hot rolled plate is distributed in strips along the thickness direction and the gradient is obvious. After normalization, the heterogeneity of the structure becomes mild. The microstructure is mainly ferrite and there is less cementite at the grain boundary. The normalization process greatly improves the quantity and distribution of inhibitors in the hot rolled plate of grain-oriented silicon steel, making the inhibitors more dispersed and fine precipitation. There are great differences in texture types and orientation density between hot-rolled plate and normalized plateγ. The strength of linear texture is weak, and the strength of rotating cube texture is also weak, and the distribution of normalized plate texture is scattered. The grain boundary type of hot-rolled plate is mainly small angle grain boundary, and the content of high-energy grain boundary and large angle grain boundary is less. After the normalization of hot-rolled plate, the grain boundary type of sample is mainly high-energy grain boundary, Σ9 and Σ13b grain boundaries with higher grain boundary energy and mobility increase significantly after normalization. Normalizing treatment is more conducive to the abnormal growth of Goss grains in subsequent high-temperature annealing.