The microstructure of bamboo chips was destoried by screw extrusion and part of parenchyma tissues were removed by screening. The obtained bamboo chips were impregnated individually by using different chemical impregnation, i.e. alkaline peroxide(AP), caustic soda(AA) and alkaline sodium sulfite(AS) and followed with atmospheric high consistency refining operation, those different chemimechanical pulps(CMP) were bleached with multiple-stage alkaline peroxide bleaching sequence and the bleached chemimechanical pulps(BCMP) were compared their bleach abilities. Results showed that, the chemical compositions of bamboo chips by removing 11.4% parenchyma tissues were significant different from these of initial bamboo chips, for instance, ash content decreased by 38.6%, cellulose content increased by 4.71%. But screw extrusion didn't cause obvious damage to bamboo fiber. AP impregnation could significantly reduce the refining energyconsumption, which was 18% less than that of AA impregnation as the Canadian standard freeness was 300 mL, and improve the bonding strength of CMP. AA impregnation produced pulps with better bulk properties but poor strength, these properties of AS pulps located among AP and AA pulps; by suing the same H2O2 dosage of 8.0%, the optimal alkali dosages of AP, AS and AA impregnation 4.5%, 4.5% and 3.5%, the bleached pulp brightness of 56.8%(ISO) was achieved from AP impregnation process, but only 49.9%(ISO) obtained from AA process.
