Kou Stroke Order: The Difference Between the Character and the Component

Kou stroke order: the quick answer (3 strokes)

The stroke order of 口 (kǒu) is: vertical (丨) → horizontal-vertical-turn (𠃍) → horizontal (一). 3 strokes in total.

1. Vertical (丨, shù): the left side, tilting slightly inward.

2. Horizontal-vertical-turn (𠃍, héngzhé): horizontal first, then turn down into a vertical — one stroke, no pen lift in the middle.

3. Horizontal (一, héng): the bottom stroke that seals the box, connecting both sides.

口, pinyin kǒu. It has only 3 strokes, and almost every mistake happens on the second one: the horizontal-vertical-turn is a single stroke, not "a horizontal plus a vertical." Get that wrong and 3 strokes turn into 4.

Step by step: how to write the 3 strokes

Stroke 1, the vertical: write downward from the upper left, tilting very slightly to the right as it falls, and keep it modest in length. 口 is a flat, wide box, and this stroke sets the height of its left side.

Stroke 2, the horizontal-vertical-turn: start at the top of the left vertical, run a horizontal to the right, pause at the right end, then turn the corner and pull a vertical down — all in one motion. The horizontal part rises slightly as it goes right; the downward part leans slightly inward. That is what makes the box look alert rather than saggy.

Stroke 3, the horizontal: the seal. Start at the bottom of the left vertical and write right until you meet the bottom of the right vertical. Both ends must connect — no gap, no overshoot. Self-check after writing: four closed corners, a flat-wide box, the top slightly wider than the bottom.

Pressure matters too: even lines and clean corners beat any deliberate thick-thin showmanship. The corner of the horizontal-vertical-turn is the one place where you press and make a crisp angle; the other two strokes are written relaxed and steady.

The 3 most common mistakes

Mistake 1: splitting the horizontal-vertical-turn into two strokes, "horizontal" then "vertical." This is the classic 口 error. The horizontal-vertical-turn is a compound stroke — the pen never lifts. Split it and not only is your stroke count wrong, the corner breaks open and looks awful.

Mistake 2: starting with a horizontal. Some learners reach for the "horizontal before vertical" rule and open with a horizontal stroke. But the first stroke of 口 is the left vertical. Rules of thumb have to fit the character; they cannot be pasted onto everything.

Mistake 3: the sealing horizontal fails to connect on one end, or pokes out past the right side. The whole job of that stroke is to close the box. A gap left open or a corner sticking out both count as non-standard writing.

Memory tricks and look-alike comparisons

Mnemonic: "Three strokes for a mouth, and don't lift the pen at the corner." The corner in stroke 2 (the horizontal-vertical-turn) is the make-or-break point of 口.

Compare with 日 (rì): 日 is just 口 with one extra horizontal inside, and it follows the exact same rhythm — build the frame, fill it, then seal it (see the 日 stroke order guide). Once 口 is solid, 日 and 目 come almost for free.

When 口 acts as a component (as in 吃 chī, 吗 ma, 叫 jiào), the stroke order never changes, but the shape shrinks: small, flat, and parked toward the upper left to leave room for the rest of the character. Full and plump when standing alone, restrained when serving as a component — two different feels for the same three strokes.

How to practice so it sticks

Air-write the three beats "vertical — turn — horizontal" 10 times, focusing on the corner in stroke 2: pause at the corner, then fold downward, pen never leaving the paper.

After 5 rounds of tracing, write a comparison row: one line each of 口, 日, and 目, and feel how all three share the same "frame, fill, seal" rhythm.

Two lines a day. If a child is writing, the parent only needs to watch two things: is stroke 2 turned in one motion, and does the sealing stroke actually connect? Leave the finer points to the standard animation in the app.

口 shows up constantly in early-grade dictation (人口 rénkǒu, 出口 chūkǒu, 口水 kǒushuǐ), so spot-check inside words: have the child write 出口 once and see whether the three strokes of 口 are still standard.

How 口 changes in different positions

口 is one of the hardest-working components in Chinese. Its shape changes with its position, but the stroke order is always the same three strokes: vertical, horizontal-vertical-turn, horizontal.

On the left (吃, 吗, 叫): small, flat, and pushed up, with its lower right corner nearly touching the first stroke of the right-hand component. The worst habit is writing it as big as a standalone 口 — it shoves the right side out of the character.

On top (只 zhǐ, 号 hào): flattened, with both verticals leaning inward more sharply, clearing space for what sits below. On the bottom (古 gǔ, 告 gào): slightly wider and flatter, holding up what sits above, with a steady sealing stroke.

Inside (问 wèn, 回 huí): the 口 inside 问 sits centered and small; 回 is "a big 口 wrapping a small 口" — outer frame first, inner 口 second, final seal last. Same old rhythm: frame, fill, seal.