In order to clarify whether the complex electromagnetic environment is of fractal characteristics or not, a fractal dimensional estimation method based on mathematics morphologic was applied to validate the scale invariance of the signal in electromagnetic environment according to the basic fractal property.Then, self similarity of the signal in the electromagnetic environment was validated by analyzing the relationship between long range dependence and self similarity, and calculating the Hurst index.The multifractal character was also validated by analyzing the partial fractal character of the signal in the electromagnetic environment.Theoretical analysis and simulation results proved that the signal in complex electromagnetic environment possesses fractal characteristic.It lays a foundation for studying complex electromagnetic environment by using fractal theory.