Abstract: Cracks were often found on TT610L steel plates for chassis frame during cold bending. A causal analysis was therefore made via chemical composition, testing for mechanical properties, optical microscopy, SEM and EDS. The results showed that the cold bending cracks along thickness of TT610L steel plate specimens are mainly caused by the Al2O3 and SiO2 inclusions in the steel, while the cracks on plate surface are mainly caused by the SiO2 inclusion. The abnormal aggregation of these inclusions is just the cause of cold bending cracks. The problem of cold bending cracks has been solved efficiently by optimizing the continuous casting process and stabilizing the continuous rolling speed.