The method of color-keeping, formula and stability of a compound nectar beverage from Chinese yam and lycium was studied in this experiment. The results show that the optimal temperature and time for scorching Chinese yam are respectively (100±1)℃ and 1.00 min; that the optimal formulation for this beverage with good flavor is 30. 00% of Chinese yam juice, 20. 00% of lycium juice, 6.00% of sugar and 0. 10% of citric acid; and that the beverage will be in a good condition of stability when 0. 03% of Xanthan ...