Nonlinearity: nonlinear relationship is a universal characteristic of nature. Brain intelligence is a nonlinear phenomenon. Artificial neurons are in two different states of activation or inhibition, which is a nonlinear relationship in mathematics. The neural network with threshold has better performance and can improve fault tolerance and storage capacity.<br>(2) Non limitation: a neural network is usually composed of multiple neurons. The overall behavior of a system depends not only on the characteristics of individual neurons, but also on the interaction and connection between units. Through a large number of connections between units, the brain's non limitation is simulated. Associative memory is a typical example of non limitation.<br>(3) Unsteadiness: artificial neural network has the ability of self adaptation, self-organization and self-learning. Neural network not only can deal with various changes in information, but also in the processing of information, the nonlinear dynamic system itself is constantly changing. Iterative process is often used to describe the evolution process of dynamic system<br>
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