This paper studied the plasma’s impacts on spruce CTMP. Spruce CTMP was treated with air, nitrogen and oxygen plasma respectively. Morphology of the CTMP fiber was captured with SEM, and carbon, oxygen and nitrogen content on the CTMP fiber surface were determined with XPS. The results showed that no matter what types of plasma were used, the roughness of the CTMP fiber would increase in the initial stage and recovered to its original roughness level following further treatment. Tensile index of the CTMP increased by 79%, 32% and 54% and the wet strength index increased by 64%, 65% and 22% with air, nitrogen and oxygen plasma treatments respectively. The increase in the tensile index and the wet strength index of the CTMP sheet was originated from the increase in C2, C3 and oxygen. C1 and nitrogen present on fiber surface wasn’t favorable to CTMP sheet strength.