Why was Sun Wukong trapped under the mountain for 500 years?

The short answer

The havoc in heaven ends with a wager: one somersault out of the Buddha's palm. Wukong's cloud carries him to five pink pillars at the end of the sky, where he signs his name — and the pillars are fingers. He never left the hand.

What the 500 years were

A sentence, not a death. The mountain pins him with a six-syllable seal; guardians feed him iron pellets and copper juice when he is hungry and thirsty. Five hundred years of that, awake.

How it ends

Chapter 14: the Tang monk climbs the mountain, lifts the seal, and calls him out as the first disciple — and fits him with the tightening fillet the same day.

The book's own arithmetic

The novel says 500 years, and also that the mountain fell in the time of Wang Mang (around 9 CE). From there to the Tang Zhenguan era is closer to 600 — a gap the book never reconciles.

The bet, as chapter 7 gives it 打賭

The captured sage laughs at the Buddha's offer: leap out of my palm and the throne of heaven is yours. One somersault is 108,000 li, and Wukong goes until the sky runs out — five flesh-pink pillars. He writes the great sage was here on the middle one, marks the base of it, and on the way back helps himself to a leak against the first pillar. Then the hand closes: the pillars were fingers, the writing is on the Buddha's middle finger, and the leak is on the thumb. The Buddha turns his hand over and makes it the mountain.

The prison 囚

The mountain is Five Elements Mountain — named for the five phases, and the Buddha's five fingers wearing geology. A seal of six golden syllables is pasted on its top, and that seal is what holds him: land gods and sky guardians are posted to the spot with a ration of iron pellets for hunger and copper juice for thirst. He can move his head; the rest is mountain. When the Tang monk finds him 500 years later, the first thing he asks is whether the old man on the mountain path is here with his freedom — the monkey has been counting years by the moss.

What the 500 years are for 用意

Heaven's whole apparatus could not reform him: furnaces, armies, executions that tickled. The mountain is the one sentence that holds, and it holds precisely because it does not argue — it waits. The 500 years sit between chapter 7 and chapter 14, between the great sage equal to heaven and the first disciple on the road, and the novel refuses to let the same creature be both at once without paying this gap first. Everything the monkey does later — the fillet he cannot remove, the rebellions he swallows — is priced against the mountain.

The wager, the pillars, the seal and the rations are chapter 7 and 14's. The reading of the 500 years as the price between rebel and pilgrim is this site's.

Where these figures come from 出處

• The novel in Chinese, chapters 7 and 14 — the wager, the seal, the rations, the release (read 6 Oct 2026)
• English Wikipedia, “Journey to the West” — the havoc and the mountain