Abstract:In order to obtain high quality purple potato granules，using“Black Beauty”potato as raw material，the key process parameters were optimized by single factor test and orthogonal test.The best combination of process parameters was obtained that the boiling time was 25 min and the cooking temperature was 95 ℃.The cooking time was 35 min and the drying temperature was 120 ℃.Under this process，purple potato granules were produced with a total powder，product yield of 22.87%，water content of 6.96%，protein content of 10.23%，starch content of 68.9%，vitamin C content of 23.64 mg/100 g，ash content of 4.06%，The anthocyanin content was 346.06 mg/100 g，the anthocyanin retention rate was 83.72 %，and the iodoblue value was 6.678 6.The results showed that potato granules had uniform color，low free starch content，high anthocyanin retention rate and good sensory quality.