BeginnerChinese Idiom (成语)

一成不变

yī chéng bù biàn

“Once established, never changes”

Meaning: Unchanging; fixed and rigid; immutable; to remain the same without any variation

Character-by-Character Breakdown

to become / established

to change / to transform

HSK 3

The Story Behind 一成不变

Source:《礼记·王制》

Period:Han Dynasty (206 BCE–220 CE)

The Unchanging Rule

The idiom 一成不变 comes from classical Chinese texts, originally referring to established rules or systems.

It emphasizes that something, once set, remains unchanged and cannot be modified.

The phrase teaches that while some things should be stable, being completely unchanging can be problematic.

It reflects the idea that adaptation and flexibility are often necessary for progress.

Original Classical Chinese

一成不变，不可改也。

How to Use 一成不变

This idiom is used to describe things that are completely unchanging, fixed, and rigid.

It emphasizes that something remains the same without any variation or adaptation.

The idiom can be used neutrally to describe stability, or negatively to criticize inflexibility.

When to use:

Use when describing things that are completely fixed and unchanging
Can be used neutrally (for stability) or negatively (for inflexibility)
Often used to criticize resistance to change or adaptation

Common Mistake

Don't confuse this with being consistent or stable. It specifically refers to being completely unchanging and rigid, without any flexibility or adaptation.

Example Sentences

这个规定一成不变，已经执行了很多年。

Zhège guīdìng yī chéng bù biàn, yǐjīng zhíxíng le hěnduō nián.

This regulation is unchanging and has been in effect for many years.

他的想法一成不变，不愿意接受新观点。

Tā de xiǎngfǎ yī chéng bù biàn, bù yuànyì jiēshòu xīn guāndiǎn.

His thinking is unchanging and he is unwilling to accept new viewpoints.

世界在变化，我们不能一成不变。

Shìjiè zài biànhuà, wǒmen bù néng yī chéng bù biàn.

The world is changing. We cannot remain unchanged.

Practice Writing

Generate a free printable worksheet with all 4 characters from this idiom.

Generate Worksheet (4 Characters)

Or explore each character:

一stroke order 成stroke order 不stroke order 变stroke order

Frequently Asked Questions

What does 一成不变 (yī chéng bù biàn) mean?

一成不变 literally means "once established, never changes." Figuratively, it means unchanging, fixed and rigid, or immutable. It describes things that remain the same without any variation or adaptation.

What is the difference between 一成不变 and 墨守成规?

Both idioms describe inflexibility, but 一成不变 refers to being completely unchanging (once set, never changes), while 墨守成规 refers to sticking to old rules or established practices. 一成不变 emphasizes being fixed, 墨守成规 emphasizes following old rules.

How do you use 一成不变 in a sentence?

Use 一成不变 when describing something that is completely unchanging. For example: "他的想法一成不变" (His thinking is unchanging). It can be used neutrally or negatively depending on context.

Is 一成不变 always negative?

Not always. 一成不变 can be used neutrally to describe stability (like a fixed rule), or negatively to criticize inflexibility. The context determines whether it's positive (stable) or negative (rigid).

Is 一成不变 difficult to learn?

一成不变 is considered beginner-friendly. It uses very common characters (一 HSK1, 成 HSK2, 不 HSK1, 变 HSK3), and the meaning is straightforward. The idiom is commonly used in modern Chinese.