Two reason:

(1) Exhibitors

Exhibitors of the Canton Fair come from various industries in China and the world. Chinese exhibitors of the Canton Fair boast good credibility and strength. Over 24,000 Chinese enterprises attend each session of the Fair. Among them, manufacturers account for 51%; foreign trade enterprises account for 38%; industrial trade enterprises account for 10%; scientific research institutions and enterprises of other types account for 1%. Excellent enterprises in the world gather at the Canton Fair. The Canton Fair sets up an International Pavilion from its 101st session and invites enterprises from all over the world to participate. It serves as a platform to demonstrate their strengths, uplift their brand images and exchange information for exhibitors from home and abroad. 

(2)Exhibits

The Canton Fair is a great trade event of comprehensiveness and specialization. It exhibits over 150,000 kinds of quality Chinese products and overseas commodities with distinctive features. The renew rate of Chinese products is over 40% each session. Depending upon China's advantages in manufacturing industry and orienting toward international market demand, the fair shows a variety of high quality products with reasonable price .