United Nations climate change talks chief Yvo de Boer said Saturday future talks would not be based on last year's Copenhagen Accord, though it could be used to resolve some issues.

"I think we can use the Copenhagen Accord to resolve a number of issues that are still outstanding," De Boer said during an exclusive interview with Xinhua.

There are some differences that can be resolved by the accord, such as the 2 degree maximum temperature increase, and financial support for developing countries, and about measuring, reporting and verification action and financial reporting.

But there were also issues left unresolved by the conference and the accord, said the executive secretary of the U.N. Framework Convention on Climate Change (UNFCCC).

"There was the third category of issues, which was still very far from resolution in Copenhagen, for example on the question of finance," he said.

"So in that sense, we have issues which were in different stages of agreement. And we also have a lot of documents to take forward in the sense that there were draft decisions on both the Convention and on the Kyoto Protocol," De Boer said.

Head of the Chinese delegation to the talks Su Wei said Saturday the Copenhagen Accord could offer important political guidance for future U.N. climate change talks but it could not replace the two-track negotiating process set by the Bali Action Plan.

The accord must not be established as the third track of future negotiations, he said.

One issue at discord during the ongoing talks is how to proceed with the negotiations, with some countries proposing to go ahead wholly on the basis of the Copenhagen Accord.

At the first round of talks since the Copenhagen conference, negotiators here are to determine how to proceed with future talks and how many additional talks are needed in the run-up to the U.N. Climate Change Conference in Mexico, which is scheduled to be held from November 29 to December 10.