Abstract: Protein from the seeds of Carica papaya L.was extracted with alkali solution and acid experimental methods after that the oil was taken off using soxhlet extraction.The results showed that the best extraction conditions were solid to liquid ratio of1∶ 40, alkali mention p H9.3, the alkaline extraction temperature of 50 ℃, alkaline extraction time 120 min with extraction rate of 48.53%.The functional properties of protein were also evaluated.The emulsification and stability of protein increased with the increase of protein concentration at p H3.Its emulsifying property was the maximum when the ion concentration was 0.2% and its' stability had been a downward trend. The foaming and stability increased with protein concentration increasing, and minimum foaming and foam stability were gotten at p H3.0. There were the highest foam ability and foam stability when ion concentration was 0.2 mol/L.So, most of protein could be extracted by this method and the protein from the seeds of Carica papaya L.had good emulsibility and foamability.The above study would provide the references for exploitation and utilization of the protein from the seeds of Carica papaya L..