  A new mechanism, the forget-remember mechanism, is proposed for studying the
spreading process in 2-state model. Such mechanism exhibits behaviors of
message spreading influenced by some kinds of functions about time and history
caring about the individuals of the spreading system, holding message or being
out of message. To demonstrate the mechanism, both linear and exponential forms
for forget-function and remember-function are simulated and show that a great
impact on the saturation of message-spreading and the relative phase
transformation.
