2009年和2010年,我作为宁夏社科院特邀研究员曾两次应邀赴日本参加第11次“外邦图”(外国地图)研究会和早稻田大学的学术交流。我报告的题目分别为《侵华日军的兵要地志与盗绘的军用地图》《日本军队的兵要地志图》。讲学之余,我在日本国会图书馆、东北大学、大阪大学见到数以万计当年日本盗测的中国地形图,其中就有宁夏的地形图。 In 2009 and 2010, as a guest researcher of Ningxia Academy of Social Sciences, I was twice invited to Japan for the academic exchange of the 11th “Foreign Map” (Foreign Map) Research Association and Waseda University. The topics that I reported were “Military Map of Topographic and Pirates of the Japanese Invading China,” “Top Map of Soldiers and Soldiers of the Japanese Army.” In addition to lecturing, I met tens of thousands of topographic maps of China in Japan at the Library of Congress, Northeastern University and Osaka University in Japan, including the topographic maps of Ningxia.