The head of the Chinese delegation and UN Secretary-General Ban Ki-moon exchanged views on the important issues at the ongoing UN climate change conference on Wednesday.

According to Xie Zhenhua, deputy director of China's National Development and Reform Commission, China and the other Basic nations including Brazil, South Africa and India had adopted a flexible attitude and hope a substantial progress can be made on financial aid and technological transfer.

"Our requirement is not high, which is the implementation of the consensus under UN Framework Convention on Climate Change and Kyoto Protocol," he said.

Xie also stressed that it will be a challenge to UN multilateral mechanism if Cancun conference can not reach an achievement.

Ban praised China's efforts as "impressive" in fighting against climate change and promoting the climate negotiations.

Ban also called on the parties to take action to achieve success in Cancun. He also added that he had held talks with some countries to persuade them to change their tunes.

The Cancun talks, scheduled for Nov. 29 to Dec. 10, has attracted about 25,000 participants from governments, businesses, non-governmental organizations and research institutions in almost 200 countries.