The response surface method was used to optimize the extraction process of soluble solids from Citrus aurantium L.Soluble components from Citrus aurantium L.pulp was extracted by 70%ethanol,then the effects of solid to liquid ratio,extraction temperature and time on the extraction rate of the soluble solids were determined by single factor test.According to the Box-Benhnken center combination test,the optimal process parameters were defined as follows:solid to liquid ratio was 1∶15,extraction temperature was 60°C,and extraction time was 4 h.U...