Measure of nonlinearity (MoN) method applied to uncertainty system

The invention discloses a measure of nonlinearity (MoN) method applied to an uncertainty system, which comprises the following steps: function space F is set to express a collection of all functions formed by specifically-distributed random variables X, and the function space F is divided into a linear function collection L and a non-linear function collection G, and MoN of a nonlinear function gk is set to be deviation between the nonlinear function gk and the linear function collection L; the approaching degree between the nonlinear function gk and the linear function collection L is obtained, measure of nonlinearity vk is then set, a linear function closest to the nonlinear function gk is solved, and measure of nonlinearity v of the uncertainty system is obtained according to the linear function closest to the nonlinear function gk. The measure of nonlinearity of the uncertainty system can be obtained.