The Long March-3B carrier rocket took off from Xichang Satellite Launch Center in the southwestern province of Sichuan at 7:18 a.m. (local time).
This is the first launch of the BeiDou satellites in 2018, which will see intensive launches throughout the year.
The two satellites are coded the 26th and 27th satellites in the BeiDou Navigation Satellite System (BDS). The BDS is also being built as rival to US Global Positioning System (GPS).
"The intensive launches will pose a great challenge. We must exercise strict control over quality specifications to ensure each of them is a success," Yang said.
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Aiming to promote international use, China will move to incorporate BeiDou into the international satellite navigation system, enhance international cooperation, and make it compatible with GPS from the United States, Russia's GLONASS, and the European Union's Galileo, he said.
The satellites and the rocket for today's launch were developed by the innovation academy for microsatellites at the Chinese Academy of Sciences and China Academy of Launch Vehicle Technology, respectively.
By around 2020, when the BDS goes global, it will have more than 30 satellites.
The Belt and Road Initiative (BRI) is multibillion dollar project started by China to build, roads, ports, railway and other infrastructure projects in different parts of the world to expand its global influence.