The just concluded talks on Iran's nuclear issue have made tangible progress, said China's representative here Wednesday.

"We could say that this round of talks have brought about tangible progress on the negotiation over Iran's nuclear issue, which is beneficial to settling the dispute through dialogue," said Ma Zhaoxu, Chinese assistant foreign minister who heads the Chinese delegation to the talks between Iran and the six world powers of Britain, China, France, Germany, Russian and the United States.

The talks were aimed to address the decade-long deadlock over Iran's disputed nuclear program.

Ma said that China has made many efforts since it joined the talks in 2006, especially in encouraging realism and flexibility among the parties concerned.

China's constructive efforts have been acknowledged by the other parties, said Ma.

However, there is still a long way to go before a comprehensive and proper settlement of the Iranian nuclear issue is found, he said.

He asked parties concerned to bolster confidence and promote the Iranian nuclear talks through dialogue and consultation with sincerity and flexibility.