Source: OT-Team(G)
From September 18 to September 20, 2025, multiple provinces and municipalities will conduct unified civil-defense (air-raid) siren tests.
The exercises are intended to strengthen national-defense awareness, improve public preparedness for air-defense and disaster response, and increase recognition of official siren signals.
Three civil-defense alert signals (pattern and purpose)
1.Pre-warning (precautionary alert)
(1)Signal pattern: Sound for 36 seconds, silence for 24 seconds, repeated 3 times (one cycle = 3 minutes).
(2)Purpose: Issued when an air attack is anticipated; warns the public to make protective preparations.
2.Air-raid warning
(1)Signal pattern: Sound for 6 seconds, silence for 6 seconds, repeated 15 times (one cycle = 3 minutes).
(2)Purpose: Issued during an enemy attack; instructs people to take immediate cover.
3.All-clear (cancel) signal
(1)Signal pattern: Continuous sound for 3 minutes.
(2)Purpose: Issued when the air-raid or threat is lifted.
Detailed test schedule
September 18, 2025
Changchun, Jilin Province
Time: 09:18–09:33
Dongguan, Guangdong Province
Time: 10:00–10:23
Haikou, Hainan Province
Time: 10:00–10:19
1)Pre-warning will commence at 10:00.
2)Air-raid warning will commence at 10:08.
3)All-clear will commence at 10:16.
Heilongjiang Province
Time: 09:00–09:10
Henan Province
Time: 10:00–10:31
Hohhot, Inner Mongolia Autonomous Region
Time: 09:30–10:00
Jiangsu Province
Time: 10:00–10:19
1)Pre-warning: 10:00–10:03.
2)Air-raid warning: 10:08–10:11.
3)All-clear: 10:16–10:19.
Shanxi Province
Time: 10:00–10:15
Shenyang, Liaoning Province
Time: 09:18
Shenzhen, Guangdong Province
Time: 10:40–11:03
1)Pre-warning: 10:40–10:43.
2)Air-raid warning: 10:50–10:53.
3)All-clear: 11:00–11:03.
Sichuan Province
Time: 10:00–10:15
1)Pre-warning: 10:00–10:03.
2)Air-raid warning: 10:06–10:09.
3)All-clear: 10:12–10:15.
Xi'an, Shaanxi Province
Time: 10:00–10:15
1)Pre-warning: 10:00–10:03.
2)Air-raid warning: 10:06–10:09.
3)All-clear: 10:12–10:15.
Zhejiang Province
Time: 10:00–10:23
1)Pre-warning: 10:00–10:03.
2)Air-raid warning: 10:10–10:13.
3)All-clear: 10:20–10:23.
September 20, 2025
Beijing
Time: 10:00–10:23
1)Pre-warning: 10:00–10:03.
2)Air-raid warning: 10:10–10:13.
3)All-clear: 10:20–10:23.
Guangzhou, Guangdong Province
Time: 10:40–11:03
Shanghai
Time: 11:35–11:58
1)Pre-warning: 11:35–11:38.
2)Air-raid warning: 11:45–11:48.
3)All-clear: 11:55–11:58.
Tianjin
Time: 10:00–10:30
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