Abstract: Since the introduction of Mobile Agent (MA), security is always an important issue for its restriction to the MAs wide-application. As the extension of distributed Client/Server computing, the present idea of multiple mobile agents gives a new way for increasing the security of the whole mobile agent system. In this paper, problems are firstly discussed in detail when applying the secret splitting scheme based on Lagrange interpolation and the subsequent multiple-signature scheme into Multiple Mobile Agent System (MMAS). Secondly, an improved and more practical scheme for the MMAS is proposed. An e-business case based on this scheme is presented at the end of this paper.