He made the remarks in response to a question asked by the Tasnim News Agency correspondent in the Austrian capital Vienna on Monday.
The Chinese official described the nuclear talks between Iran and six world powers as positive and said the two sides are doing their best to reach a comprehensive deal by July 20 deadline.
Qun said the drafting process of the final nuclear deal has already started.
Iran and the Group 5+1 (alternatively known as the P5+1 or E3+3) inked an interim deal on Tehran’s nuclear program in Geneva last November, which came into force on January 20. The interim deal (the Joint Plan of Action) stipulates that over the course of six months (July 20), the parties will draw up a comprehensive nuclear deal which will lead to a lifting of the whole sanctions on the Islamic Republic.
Iran and the Group 5+1 (Russia, China, the US, Britain, France and Germany) started new round of high-profile negotiations in the Austrian capital on June 16.
The five-day negotiations are aimed at drafting a comprehensive deal to resolve the decade-long standoff over Tehran's peaceful nuclear energy program.