A car bomb ripped though a luxury hotel carpark in the Pakistani city of Quetta on Wednesday.
The blast killed four people and wounded 11.
China's ambassador to Pakistan was staying at the Serena hotel, but authorities say he was not there when the bomb exploded.
The Pakistan Taliban claimed responsibility for the bombing.
A spokesman for the militant group wrote in a text message to Reuters that a suicide bomber carried out the attack with a car full of explosives.
But it was not clear if the Chinese envoy was the target of the attack.
The Chinese Embassy did not respond to a request for comment.
Quetta is the capital of Balochistan province bordering Iran and Afghanistan.
It's also home to the newly expanded Gwadar deepwater port that is key to a planned $65 billion investment in China's Belt and Road Initiative.
Chinese nationals and their interests in the region have been attacked before by Taliban militants and nationalist insurgents.