layer is penetrated which making the transferred alkaline accelerant react with functional groups on the fibres such as hydroxyl thus the reactivity of nucleophilic reaction of active groups is improved and the fixation reaction is facilitated and catalyzed finally the fluid which penetrates into the fabric layer completes the mass transfer and flows from the circulated fluid outlet comes into the next cycle of circulation fluid circulation alternates with static and the treatment time ratio is of 1 10 relief pressure after treating the textiles with phase transfer catalytic fixation reaction in fixing reactor as long as 60 min and recycle the carbon dioxide and residual fixation catalyst in the system meanwhile in the case of the other conditions unchanged the experiment of no fixation accelerant na 2 co 3 and phase transfer catalyst fc 134 is performed as a blank control one furthermore the cotton fabrics completing the dye fixation are used for analysis and testing of dye fixation with reference to the steps and process above analysis of dye fixation about disperse reactive red on cotton fabrics and the testing results are as follows for the sake of the analysis of fixation ratio of dyes on fabric acetone is adopted in the fat extractor in order to extract the floating colour which is unfixed on fixed cotton fabric under the condition.