Abstract:In my country，a large amount of scraps rich in astaxanthin and chitin and other high economic value components are produced every year.Continuous extraction of astaxanthin and chitin was carried out with crayfish leftovers as raw materials.To be specific，the raw materials were deproteinized，and astaxanthin was extracted by the ethyl acetate extraction method，followed by the extraction of chitin from the remaining solids by the HCl/NaOH extraction method.Through single factor test and response surface methodology optimization，the optimal extraction conditions for astaxanthin were determined as follows:the solid-to-liquid ratio of 1∶19（g/mL），the extraction time of 120 min，and the extraction temperature of 34 ℃.Under the above conditions，the extraction rate of astaxanthin could reach 67.40 μg/g.The optimal extraction conditions for chitin were obtained as follows:HCl solution concentration of 1 mol/L，soaking time in HCl solution of 20 min，NaOH solution concentration of 1 mol/L，and soaking time in NaOH solution of 6.5 min，and the extraction rate of chitin under these conditions was 24.13%.