Point at the technical requirements of authentication management for man-machine interface (MMI) application on smart phone of feeder terminal unit (FTU), the authentication server should be built in the distribution network control center to realize the security protection for the MMI application onsmart phone.In order to realize the purpose of login authentication for MMI application by asynchronous double factor security system in the control center service software, the dynamic password authentication technology was used with the challenging/responsing mode, and the authentication information was transmitted by the smart phone short message, and tiny encryption algorithm (TEA) was used to encrypt and decrypt the content of short message.On the basis of analysis and study of relevant theories and methods and implementation techniques, the authenticationsoftware was implemented which has been deployed in the user control center room. At last, the purpose of project development has been achieved.