Five media were adopted to study the effects of three plant growth regulators (GA3?NAA?BAP) on the micropropagation of five Virus-free tube potato plantlets. The results showed:The number ③ medium (MS+1mg/L GA3+0.1mg/L NAA) is suitable to the micropropagation of Kexin No.4 ?Kexin No.13 and Youjin; The number ④ medium(MS+0.01mg/L BAP+0.05mg/L NAA) is suitable to the micropropagation of Zaodabai; However, The number ① medium (MS medium ), which has no plant growth regulators, is suitable to the micropropagati...