Abstract: Mao Wen-long was an important Anti-Qing general in the late Ming dynasty，who had an inneglected status in the war between Ming and Qing dynasties. Three hundred years from then on，there had been a long-time debate among academia and people about the evaluation of Mao Wen-long and Yuan Chong- huan. The paper selected three representative issues such as the relations between Mao Wen-long and the eunuch clique，had Mao Wen-long exaggerated the quantities of his army，and had Mao Wen-long lied in his reports，by which to have a detailed analysis on the merits and demerits of Mao Wen-long. Then we analyzed the deep social and historical reasons concealed in these three issues，in addition to subjective and objective related factors which had affected judgment.