问题不大，只一点点，我改过，你试下，与你的图会不同，程序如下：x = -5:0.2:5;y = -5:0.2:5;[X,Y] = meshgrid(x,y);Z =(0.25*X.^2.*Y+0.25*Y.^3+X.*Y+0.5*Y)./ ((0.5*X.^2-0.5*Y.^2+X+1).^2+(X.*Y+Y).^2);contour(X,Y,Z,'ShowText','on')
