在人教版历史必修第4课“古代的经济政策”中有一幅“清乾隆二十五年(1760年)发给中国商人的海外渡航证明书”的插图。在讲述‘海禁’与‘闭关锁国’“一子目中,课文提及:”清初,为了对付东南沿海的抗清斗争,政府厉行海禁,禁止官民私自出海;又将沿海居民内迁数十里,不许人民寸板下海,实行‘闭关锁国’政策。“由课文内容可知,清朝的海外贸易政策比明朝更为严格,不仅厉行海 In PEP 4, Ancient Economy Policy, there is an illustration of ”Certificate of Overseas Ferry Passed to Chinese Traders for the Twenty-Fifth Year of Qing Emperor Qianlong (1760).“ In a subheading about the ’ban on the sea’ and the ’closed-door state of China’, the text mentions: ”In the early Qing Dynasty, in order to deal with the southeastern anti-Qing struggle, the government implemented the sea ban and prohibited officials from illegally entering the sea. Ten years, people are not allowed to go down to the sea and implement the policy of “closing the door and locking up the country”. "From the content of the text we can see that the Qing foreign trade policy more stringent than the Ming Dynasty, not only practicing the sea