Research for Plotting Diagram of Open-loop Systems

The method of effective plotting diagram of open-loop systems was studied in two aspects. Firstly, his calculus was efficaciously improved:the common formula of real and imaginary frequency response was advanced that is convenient for manual computation and more convenient for compute programming.Secondly, two criterions are posed for use of quick confirming the forms of diagram:they are the criterion of original asymptote and cross-point on real and imaginary axes.