"On the Sea", namely "The Influence of the Sea on History", was published in the United States in 1890 and was the first successful work of Mahan Hai's theory. The book attracted attention as soon as it was published. The United States, Japan, Germany, the Soviet Union and other countries have successively used it as a guide for formulating national development strategies. China's current severe maritime situation has become the consensus of the Chinese people. If China wants to rise and the Chinese nation wants to achieve great rejuvenation, it must break the shackles of the sea and truly move towards a better and vast world. Controlling the sea has become a problem that the Chinese nation has to face head-on. We hope that the book we have carefully republished will enable every reader to understand the current situation and the heavy pressures China is facing, help China break through the ice and achieve glory, and make you no longer confused about China's future.