Guangzhou to Dushanbe, Tajikistan

Hi, I will be in transit through Guangzhou to Dushanbe (staying less than 24 hrs in the airport). In this case I do not need a china visa right? I have my onward ticket to Dushanbe but the problem is I am getting visa on arrival at Dushanbe. Would there be any problem for me when arriving / leaving Guangzhou airport?