Real-time and independence are the main requirements of control soft operation system. Linux OS with open source codes satisfies the Posix criterion,but its timesharing mechanism should be converted to real-time.

• 对具有开放源码的操作系统LINUX进行了详细的讨论，分析了LINUX内部进行分时操作的机制及在其之上进行实时扩展的可能。