this paper did a profound research on the stochastic material of Electro-optic (EO) polymers and mathematic model, and analyzed the stationary stochastic processes, derived the stochastic process mean and autocorrelation function. Setup a bidirectional diode circuit model as a stochastic system to perform the analysis method. The work done here is very useful for the related subjects such as material analysis, signal processing and system analysis, or linear system design.