United States Treasury Secretary Jacob Lew arrives in China on Friday for a two-day visit on the last leg of a five-nation Asian tour.

While he is expected to hear about China's commitment to market opening when meeting Chinese leaders, China will require US commitment on issues such as the debt ceiling, observers say.

Lew is the first high-ranking US official to visit China after the Third Plenum of the Communist Party of China's 18th Central Committee ended on Tuesday with a communique underlining the market's decisive role.