Abstract: Broadcast is the most basic one means of communication in ubiquitous computing computing environments.It is very important to research broadcast communication security protocol.Point-to-point identification model does not suitable for broadcast security；digital signature method is too high to hardware request of ubiquitous computing.In this paper，a safety program to identify is brought forward based on symmetric key algorithm，the key issue way’s improvement met the broadcasting hardware security identification in ubiquitous computing environment，and the μTESLA’s avoids the node attack because of time synchronization errors.The improved program obtains a higher safety performance.