Aiming at the restriction of the limited hardware resources in sensor network nodes

analyzing the drawbacks of the design of the present operating systems

a new software frame of the operating system is presented based on the Arena operating system

which allows the system function module and the application program module to be dynamic loaded and replaced at run-time.The frame ensures the secured upgrade of the system code.This frame leads to the lower power and highly-credible operating system function

moreover it supports the reconfiguration and self-adaptation in the sensor network system.