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In the Eastern Han Dynasty, there was a man named Sun Jing, a famous politician. At first, because of his shallow knowledge, he was not reused, and even his family looked down on him, which greatly stimulated him. He made up his mind to study hard, often closed the door and continued reading alone. Reading from morning till night every day, often forgetting to eat and sleep. After studying for a long time, I am tired, but I still don't rest. After a long time, I was too tired to doze off. Afraid of affecting his study, he came up with a special method. In ancient times, men had long hair. He found a rope and tied it firmly to the beam. When he is tired of reading, he dozes off. When his head is lowered, the rope will hold his hair and hurt his scalp, wake up immediately and continue to study. This is the story of Sun Jing's Hanging Beam.