Chinese and US officials have discussed hacking concerns at the inaugural meeting of a joint US-China working group on cyber security.
The meeting was a prelude to an annual high-level forum between the world's two largest economies.
The US has previously accused China of commercial cyber espionage - something China denies.
The US-China talks have also been overshadowed by allegations that the US has hacked into Chinese networks.
The claims were made by fugitive US whistleblower Edward Snowden.