Abstract:Sun drying，60℃ hot air drying，100℃ hot air drying，vacuum freezing drying and microwave drying were investigated in terms of the impact of the quality on dendrobium offcinale.From physical properties，the color of dendrobium offcinale power prepared by freezing drying and sun drying was the best.From nutritional ingredients，the content of total amino acids，essential amino acids and various mineral elements were the highest under sun drying，followed by vacuum freezing drying.From bioactive compounds，the content of polysaccharide，total phenol and total flavonoids were the highest under vacuum freeze-drying，followed by sun drying.In summary，vacuum freezing drying and sun drying were better drying methods than other three ones.