Abstract: The behavier of a prehydrolysis caustic bagasse pulp in the viscose process was studied in comparison with a spruce sufite pulp. The degree of swelling in different concentrations of alkali solutions, the changes of carboxyl and aldehyde group contents and viscosity of the regenerated cellulose under various ageing conditions of alkali cellulose, the changes of solubility and degree of esterification of xanthate with different amounts of CS2 used during xanthation and the spinning with viscose method were compared. It was found that both pulps had a maximum degree of swelling in alkli solution at a concentration of 10-11 % NaOH. At the same concentration, the degree of swelling of bagasse pulp was greater than that of spruce pulp. With the increase of ageing temperature and time the carboxyl group content of cellucose increased, the viscosity decreased, but no much change in the aldehyde group content was observed. At the same condition of ageing, the oxidation and degradation of bagasse cellulose was faster. No much difference between the two pulps was found in the changes of solubility and degree of esterification of xanthate at xanthation with various amounts of CS2. The tensile strength of viscose filament from bagasse was 2.23 g/d (dry), 1.68 g/d (wet). This experiment confirmed the applicability of bagasse for the preparation of staple fiber.