输入以下行，添加第二个图例： ax2.legend(loc=0) 结果如下： [DLZkF.png] 但如果你想要在一个传说上的所有标签，那么你应该这样做： import numpy as np import matplotlib.pyplot as plt from matplotlib import rc rc('mathtext', default='regular') time = np.arange(10) temp = np.random.random(10)*30 Swdown = np.random.random(10)*100-10 Rn = np.random.random(10)*100-10 fig = plt.figure() ax = fig.add_subplot(111) lns1 = ax.plot(time, Swdown, '-', label = 'Swdown') lns2 = ax.plot(time, Rn, '-', label = 'Rn') ax2 = ax.twinx() lns3 = ax2.plot(time, temp, '-r', label = 'temp') # added these three lines lns = lns1+lns2+lns3 labs = [l.get_label() for l in lns] ax.legend(lns, labs, loc=0) ax.grid() ax.set_xlabel("Time (h)") ax.set_ylabel(r"Radiation ($MJ\,m^{-2}\,d^{-1}$)") ax2.set_ylabel(r"Temperature ($^\circ$C)") ax2.set_ylim(0, 35) ax.set_ylim(-20,100) plt.show() 结果： [Z8pg4.png]... 展开详请