At room temperature, with 0.2% citric acid, 0.3% Vc solution soaked for 45 min, 90 ℃ scalding 1 min, vacuum time 25 s, heat sealing time 3 s, heat sealing temperature of 200 ℃ under the conditions of the vacuum packaging is the best, at room temperature can be maintained for 8-10 d without discoloration, at 4 ℃ low temperature can be stored for 1 month without discoloration.