Objective: To optimize the decolorization technology of the extract of Nervilia fordii . Method: The loss of free amino acids and decolorization of the extract of N fordii were used as index. On the base of single factor screening

the effects of the pH value

the amount of activated carbon

decolorizing temperature and decolorizating time were investigated. The uniform design was adopted for getting the optimal mixed technique parameters

and verified by experiment. Result: The pH value of extract solution was 3.0; the activated carbon added was 0.01 g \5L-1; tempetature was at 40 ℃

and decolorizing time lasted for 20 min. Conclusion: The optimized extraction process is stable and feasible.