Resuming cyber-security cooperation between China and the USA would be difficult because of "mistaken US practices", China's top diplomat told US Secretary of State John Kerry.
In May, the US charged five Chinese military officers with hacking American firms, prompting China to shut down a bilateral working group on cyber-security.
Last Wednesday the FBI said hackers it believed were backed by the Chinese government had launched more attacks on US companies, a charge China rejected as unfounded.
Yang Jiechi, a state councillor overseeing foreign affairs, told Kerry in Boston the US "should take positive action to create necessary conditions for bilateral cyber-security dialogue and cooperation to resume", according to a statement seen on the Chinese Foreign Ministry website on Sunday.
"Due to mistaken US practices, it is difficult at this juncture to resume Sino-US cyber-security dialogue and cooperation," Yang was quoted as saying. The statement did not elaborate.
The US has repeatedly accused China of hacking, but Asian superpower has accused Washington of hypocrisy, citing its own evidence of hacking attempts and revelations from former US spy agency contractor Edward Snowden that the NSA had hacked into official network infrastructure at universities in China and Hong Kong.