In aiming at the problem of poor reusing of different bit control instruction processing codes in rocket telemetry real-time processing software, the general steps of bit control instruction processing are abstracted by analyzing the processing characteristics of several typical bit control instructions, and the definition of bit control instruction is given from the point of view of software. According to the principle of C++ language polymorphism, the software implementation of the bit control instruction is divided into abstract base class and implementation subclass, the processing logic of the bit control instruction is standardized, and the processing characteristics of different bit control instructions are presented. The application practice shows that the amount of code is significantly reduced, the process flow is more clearer, and the software reuse rate is greatly improved.