Random-like properties of typical Lorenz chaotic system and Rssler chaotic system are analyzed and discussed by using symbol entropy algorithm.Firstly,the binary sequences are obtained from real-valued sequences generated by continuous chaotic systems,then are coded.Symbol entropies of the binary sequences are calculated and their curves are plotted.Influences of system parameter and initial value on symbol entropy are discussed.Simulation result shows that symbol entropy algorithm can be used to identify ...