Beijing said the test was "routine" but analysts say that is odd as the last such test was in 1980.
China has said it successfully launched an intercontinental ballistic missile (ICBM) carrying a dummy warhead into the Pacific Ocean.
The ICMB was launched at 08:44 local time (04:44 GMT) on Wednesday and "fell into expected sea areas", Beijing's defence ministry said, adding that the test launch was "routine" and part of its "annual training".
The type of missile and its flight path remained unclear, but Chinese state media said Beijing had "informed the countries concerned in advance".
Analysts said Beijing's description of the test as "routine" was surprising because the last such test happened in 1980.
China's nuclear weapon tests usually take place domestically and it previously test-fired ICBMs west into the Taklamakan Desert in the Xinjiang region.
This is tangential, but am I the only one getting sick and tired of all the topics about China? The imperial core's news industry's obsession with the country has never been healthy, and none of the articles being posted have had me thinking any of that is changing. I'm seeing post after post, usually from the same two users, and I'm starting to worry that the line between "documenting the atrocities of an authoritarian country" and "sinophobia" might start to get blurry.
To be clear, I'm not trying to point fingers. I don't want to make assumptions about the users in question. I've just been seeing this for a few months now and it's getting on my nerves, especially given the political climate of the United States.