“海禁”政策被许多人等同于“闭关锁国”政策,实际上两项政策在来源和含义方面有明显不同,“海禁”政策的实施时间也并不局限于明清时期。本文试图通过“海禁”政策与“闭关锁国”政策的对比,对“海禁”政策开始出现的时间进行考察,还原历史真相,以促进课堂教学的有效性和教学能力的深度提升。 The “ban on sea” policy is equivalent to the “closed-door policy” by many people. In fact, the two policies differ significantly in their sources and meanings, and the “ban on sea” policy is not limited to the Ming and Qing Dynasties. This article attempts to examine the starting time of the “Ban on Sea” policy by comparing the “ban” policy with the “closed-door state” policy, restoring the historical truth so as to promote the effectiveness of classroom teaching and enhance the depth of teaching ability .