Summary of rules for plotting root locus Rule #l The Starting points and the End points of the root locus(根轨迹的起点和终点) Rule #2 The Segments of the Root Locus on the Real axis(实轴上的根轨迹) Rule #3 The Symmetry and the Asymptotes of the root locus(根轨迹的对称性和渐近线) Rule #4 The Real Axis intercept of the △ asymptotes(渐近线和实轴的交点)Summary of Rules for Plotting Root Locus Rule #1 The Starting Points and the End Points of the Root Locus (根轨迹的起点和终点） Rule #2 The Segments of the Root Locus on the Real Axis (实轴上的根轨迹） Rule #3 The Symmetry and the Asymptotes of the Root Locus (根轨迹的对称性和渐近线） Rule #4 The Real Axis intercept of the Asymptotes (渐近线和实轴的交点）