China's Commerce Ministry said Australia's ban on Chinese technology giant Huawei Technologies from bidding to help build a nationwide high-speed Internet network is "unjust."
Australia said the ban is due to concerns about cyber attacks traced to China.
Ministry spokesman Shen Danyang said late Friday that Australia should not exclude Huawei from participating in a fair competition in the name of security.
Danyang said Huawei has provided broadband network equipment and services for many countries and has operated in Australia for nearly a decade.
The ban highlights concern about a spate of hacking attempts aimed at Western companies and the role of Chinese equipment providers, which are expanding abroad.