Aimed at the problem that the computer terminal is the source of the safe risk in the network system, this paper proposed a new reliable terminal model based on non-interference theory.

Acquisition model perspective drawing: to enquire by the acquisition device level structure of acquisition point operating terminal electric energy meter total add group etc.

In this paper we consider second order nonlinear terms, set up more precise dynamic system's model and derive the computation formula of terminal perturbation deviation by state variation.