Taking Smllantus sonchifolium and Citrus paradisi cv as test materials,the processing technology of compound juice of Smllantus sonchifolium and Citrus paradisi cv were studied.The results indicated that the optimum processing conditions were 10∶4 ratio of yacon juice and shaddock juice,50% of the mixture of yacon and shaddock juice,0.05% of citric acid,12% of sugar,4% of honey respectively.The best stabilize was the mixture of 1% xanthan gum and 1% CMC-Na.Under the optimal conditions,the achieved compound juice had smooth taste,full yacon and shaddock flavor and better form.