论述了五种智能仪器及控制系统的加密方法，即：字节分割分存法、随机位分割法、奇偶分割分存法、关联控制法、奇偶地址控制法，其共同特点是：采用硬、软结合方式实现加密，具有电路简单，实现容易，成本低，被解密难度大等优点，有一定的实用推广价值 Discussed five kinds of intelligent instruments and control systems encryption method, namely: byte division method, random bit division method, parity division method, association control method, parity address control method, its common features are: the hard, Soft combination to achieve encryption, with the circuit is simple, easy to implement, low cost, is difficult to decrypt the advantages of a certain practical value of promotion