The grammar of a Chinese metro: scanners, ride codes, and exit letters

Most travelers lose their first hour in a Chinese city not to the language but to the choreography — the bag scanner at the metro mouth, the ride code they cannot find, the exit lettered like a seating chart. None of it is hard once you know the order it happens in, and the order is the same in Beijing, Shanghai, Chengdu, and Guangzhou, give or take a sign.

The bag goes on the belt

Every metro entrance runs a security check, 安检 (ānjiǎn), and there is no way around it — one X-ray belt, one guard with a handheld wand, sometimes a second guard watching the screen. Put your backpack and any hard case on the belt, keep walking through the frame, and collect it on the far side. You do not empty your pockets, you do not remove a laptop, and a power bank stays in the bag. The one thing that trips people up is liquid: if you carry an open bottle, a guard may ask you to take a sip in front of them, 喝一口 (hē yì kǒu), to prove it is water and not fuel. Lighters and small pocket knives are commonly confiscated, so leave the multitool in the hotel. At a quiet station the whole pass takes under a minute; at an interchange like Beijing's Xidan (西单) during the morning push, the belt backs up and you queue, which is the first argument for not arriving at 08:30.

The ride lives inside your payment app

There are no paper tickets to buy if your phone is set up. Open Alipay (支付宝, Zhīfùbǎo) or WeChat (微信, Wēixìn), find the ride code — 乘车码 (chéngchēmǎ) — and hold the QR flat against the reader at the turnstile going in, then again going out. The gate reads distance and settles the fare on exit, so you must scan both times or the system flags an incomplete trip. A screenshot will not work; the code refreshes roughly every minute for exactly this reason. Fares are distance-based and cheap: Shanghai and Beijing both start around ¥3 for the first six kilometres and climb a yuan or two from there, so a cross-city ride rarely tops ¥8. Paper-token machines, 自动售票机 (zìdòng shòupiàojī), still stand at every station and take coins and small notes if your phone is not registered, but each city sells its own token and the queue at rush hour is slower than the code. If you are staying a week, a stored-value transit card — Beijing's 一卡通 (yīkǎtōng), Shanghai's 交通卡 (jiāotōngkǎ) — buys you a physical tap-and-go and works on buses too.

进站和出站都要刷乘车码，地铁费用在出站时按里程自动结算。

Transfers are long corridors, not platforms

Changing lines, 换乘 (huànchéng), is where the map lies to you. On the diagram two lines cross at a neat dot; underground that dot can be a four-minute walk down a tiled corridor, up an escalator, and along a mezzanine. Follow the coloured signs — each line has a fixed colour, and the transfer arrow is printed in that colour with the line number in a ring — rather than trusting the direction you think you are heading. At major interchanges such as Guangzhou's Tiyu Xilu (体育西路), three lines braid through one station and the wrong corridor commits you to a full loop back. You do not scan again when you transfer inside the paid area; the gates only appear at the true entrance and exit.

Exits are lettered, not numbered

Underground stations sprawl, and the gap between Exit A and Exit D can be a ten-minute walk and the wrong side of a six-lane road. Shanghai's People's Square (人民广场, Rénmín Guǎngchǎng) has close to twenty lettered mouths, some split further into A1 and A2, each surfacing onto a different street. Signs list every exit by letter with nearby landmarks in both English and Chinese, so read the letter before you climb the last stair — once you tap out and surface, going back means scanning in again and, at a distance-priced station, potentially paying a small re-entry fare. When a navigation app hands you an exit letter, trust the letter over your sense of direction; the app knows which side of the road you want and your instinct, underground, does not.

Getting the timing and the small stuff right

Most city systems run roughly 05:30 to 23:00, with the last train earlier than you expect on outer branches — check the platform board, which lists 末班车 (mòbānchē), the final departure, in both scripts. Avoid 07:30 to 09:00 and 17:30 to 19:00 if you can; the crowd on Beijing Line 1 or Shanghai Line 2 at peak is a physical negotiation, not a ride. Keep your phone above twenty percent, because a dead battery means no ride code and a scramble for a token machine that may only take coins. The single mistake to plan against is the open water bottle at security — drink from it before the belt, or cap it and expect the sip test — and the second is climbing out of the wrong exit letter, which costs you the ten-minute walk and the crossing you were trying to avoid.