The chaotic characteristics of GM(1,1)

In this paper, taking into account the reality of the nonlinear system, we introduced nonlinear item into Unbiased model GM(1,1) and then deduce its Logistic expression. Based on the expression, we analyzed the steady state, periodic state and chaotic characteristics of Unbiased model GM(1,1). Finally, the superiority of Unbiased model GM(1,1) are well explained with chaos theory.