Abstract Grain boundary character distributions×(GBCD) in Pb alloy after varying kinds of thermomechanical treatments were analyzed by electron back scatter diffraction (EBSD) and orientation imaging microscopy (OIM). The frequencies of lowΣcoincidence site lattice(CSL) grain boundaries in Pb-alloy can be enhanced to more than 70% after proper cold rolling combined with annealing which was carried out at high temperature（0.9 Tm ）for a very shot period of time. Together withΣ1 boundaries, the Σ3 boundaries appeared during recovering. The development of Σ3 boundaries in the process of recovery and recrystallization is the main reason for enhancing the frequencies of lowΣCSL grain boundaries. Triple junctions which contained three CSL grain boundaries could be easily find in the OIM of the specimen that had high frequencies of lowΣCSL grain boundaries, and there are specific orientation relationships among the grains assembled by the triple junctions
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