The arrest has seriously strained relations between China, and the US and Canada.
Beijing says it is an "abuse of the bilateral extradition treaty" between Canada and the US, and has expressed its "resolute opposition" and "strong dissatisfaction" with the proceedings.
China also says the accusations against Huawei, the world's second biggest smartphone maker by volume, are a "witch-hunt".
Two Canadian citizens are thought to have been detained in China in retaliation for the arrest.
China and the US are also engaged in tough trade negotiations to end a major tariff dispute.
