Although the military e-procurement system has reached the beginning goal of the electronic, but still have efforts to achieve comprehensive utilizes. The reason is the security consideration. Electronic data processed and stored on the Internet may increase the risk of data leakage. The study based on cryptography theory to enhance the security of military e-procurement system, and further to induce self-certified Multi-document blind signature scheme to mitigate the security concerns on the current procurement system and to avoid the counterfeiting user identity weakness of issue certificate process. At the same time, it can also reduce the cost and risks of public key storage, computation and management. Our study is not only to reduce blind signature times, to simplify the transmission time and multiple blind signature operation, but also solves the snooping and tampering problems of identification and document.