From the way of expression, it is a landscape poem "Viewing the Sea" by Cao Cao, a poet in the late Eastern Han Dynasty, and it is a four-character (Yuefu) poem. Author Cao Cao, whose real name is Meng De, Geely, Xiaozi and Guo Peiren. An outstanding politician, strategist, writer and calligrapher in the late Eastern Han Dynasty. After Cao Pi, the founder of the Cao Wei regime in the Three Kingdoms, proclaimed himself emperor, he was honored as Emperor Wu, with the temple name Taizu. Viewing the Sea is selected from Yuefu Poems and added by later generations. The original text is the first chapter of Out of Xiamen. In the 12th year of Jian 'an (A.D. 207), Cao Cao had a whim to March to the seaside and climb the mountain to see the sea on his way back to his division after the Northern Fifth Ring Road. This four-character quatrain is a magnificent picture of the sea outlined by the poet Cao Cao with a lot of romantic passion when he climbed the Jieshi Mountain to look at the sea. It depicts the magnificence of the motherland's rivers and mountains, not only the magnificence of mountains and seas, but also the enterprising spirit of the poet who lives by heaven and cares about the world. Looking at the Sea is a famous work in Jian 'an period, and it is also one of the early masterpieces of classical four-character poems. Climb Jieshi Mountain to the east and enjoy the wonders of the sea. The waves are stirring, and the islands in the sea are listed and towering into the sky. Surrounded by lush trees and flowers, the bleak wind came, the vegetation shook, and the sea set off huge waves, rolling and whistling, as if to engulf the universe. The ups and downs of the sun and the moon seem to come from the chest of the sea; The bright stars in the Milky Way also seem to emerge from the embrace of the sea. Ah, I'm so happy, so beautiful, I can sing and express my feelings freely.