The grounds for refusal, in the law's own words
Article 25 lists when foreigners shall not be allowed to enter: they hold no valid documents or refuse or evade inspection; they fall under an Article 21(1)-(4) circumstance (an unexpired no-entry period after deportation; a serious mental disorder or infectious disease severely jeopardising public health; a risk to national security, interests, or public order; or fraud in the application or inability to guarantee expenses); they may act outside their visa type after entry; or another statutory ground applies.
Article 25 · Exit and Entry Administration Law of the People's Republic of China (National Immigration Administration, page dated 2021-03-10, read 2026-07-25)
They do not have to tell you why
Article 25 states plainly that exit/entry border inspection authorities are not required to give reasons for denying an entry. This is the fact that turns a refusal from a mystery into an understood, if unwelcome, outcome: an unexplained refusal is the law operating as written, not a mistake to argue on the spot.
Article 25 · Exit and Entry Administration Law of the People's Republic of China (National Immigration Administration, page dated 2021-03-10, read 2026-07-25)
What happens right after a refusal
Under Article 26, border inspection authorities shall order foreigners who are denied entry to return, and shall force the return of those who refuse to do so. While waiting for return, those foreigners shall not leave the restricted zones of the port.
Article 26 · Exit and Entry Administration Law of the People's Republic of China (National Immigration Administration, page dated 2021-03-10, read 2026-07-25)
On-the-spot and continued interrogation
Article 59 allows persons suspected of an exit-entry violation to be interrogated on the spot, and interrogated in continuation where they are suspected of illegally exiting or entering, assisting others to do so, illegally residing or working, or endangering national security or interests or public order.
Article 59 · Exit and Entry Administration Law of the People's Republic of China (National Immigration Administration, page dated 2021-03-10, read 2026-07-25)
Detention for investigation has a 24-hour interrogation rule
Under Article 60, a foreigner who cannot be cleared of suspicion after on-the-spot or continued interrogation may be detained for investigation. The authority shall present a written detention decision and interrogate the detained foreigner within 24 hours, and shall release them immediately if the detention is unwarranted.
Article 60 · Exit and Entry Administration Law of the People's Republic of China (National Immigration Administration, page dated 2021-03-10, read 2026-07-25)
Some people cannot be detained this way
Article 61 exempts foreigners who are seriously ill, pregnant, breast-feeding their own infant under one year old, under 16, or 70 or over from detention for investigation. Their movement may instead be restricted, for a period not exceeding 60 days.
Article 61 · Exit and Entry Administration Law of the People's Republic of China (National Immigration Administration, page dated 2021-03-10, read 2026-07-25)
Repatriation carries a re-entry ban
Article 62 allows repatriation where a foreigner fails to leave within a time limit, is involved in circumstances in which they may not enter China, or illegally resides or works. A repatriated person shall not be allowed to enter China for one to five years from the date of repatriation.
Article 62 · Exit and Entry Administration Law of the People's Republic of China (National Immigration Administration, page dated 2021-03-10, read 2026-07-25)
The disqualifiers a permit officer applies (transit example)
The published grounds for refusing a 24-hour transit permit show the kind of disqualifier an officer applies in practice: not being allowed to enter by law; a passport valid for less than 3 months or bearing a rejection stamp from China's visa-issuing agencies; records of illegal entry, exit, residence, or work within 5 years; or severe accommodation-registration violations within 2 years. These are scoped to the transit permit but illustrate the same reasoning.
Interpretation of the 24-hour Visa-free Transit Policy for Foreigners (National Immigration Administration, page dated 2021-04-01, read 2026-07-25)