Abstract: Processed mulberry juice has the longest absorbing wavelength in 720nm. The results of the study of clarification of mulberry juice by means of chitosan showed that transmittance was over 80% and the amount of soluble solid content and Vc was remained almost unchangeable when the amount of chitosan was at 0.4～0.7g/L,the temperature at 35～55℃ and the pH at 2.5～4.5, After the orthogonal trial, the optimum technological conditions for mulberry juice clarification by using chitosan were 0.6g/L, 45℃and pH4.5.

Key words: chitosan, mulberry juice, clarification