With the win, China extended their unbeaten run in the 2015 edition of the tournament to seven matches, while Thailand suffered their fourth loss against three wins.
In the third and final week of the preliminary round in Hong Kong, world No3 China proved too strong for the 12th-ranked Thais, winning 25-18, 25-14, 27-25.
The Thais looked exhausted after a long journey from Brazil where they beat Germany and Belgium and lost to the hosts in the second week.
They started their match against China in a sluggish manner and some lapses of concentration cost them dearly in the first two sets.
Corrective measures taken by Thailand coach Kiattipong Radchatagriengkai started working a bit too late in the match but his team did perform in an impressive manner in the final set.
With the Chinese enjoying a massive 2-0 lead, the Thais refused to give in and the see-saw battle in the dying moments in the third set gave everyone a good measure of their calibre as they recovered from the brink of defeat a number of times before allowing their rivals to wrap up the match.
The main Chinese weapon last night was Ting Zhu who amassed 24 points in the encounter. She was closely followed by Yuan Xinyue with 17 points, including nine kill blocks.
Thailand have now gone down to China 16 times in their 18 meetings in all competitions.
The Chinese had finished off the Thais at the Asian Championship in May on their way to winning the crown.
At the Hong Kong event, Thailand are now scheduled to face world No1 US, whose height and might could prove to be too much for the national team to handle today (July 17).
Thailand's last match of third leg will be against world No4 Japan tomorrow (July 18).
Thailand squared off against Japan in the opening leg which was played in Bangkok and lost easily to their rivals on that occasion.
Although it is not likely that Thailand will reach the six-team finals to be held in the US later this month, they should at least be able to avoid relegation to a lower division next year.
Earlier yesterday, the US overpowered Japan 3-0 (25-23, 25-22, 26-24) in the opening match of Pool H.
The US started the match well and had a firm grip on the proceedings in the court as their towering blocks and the confident spikes had the Japanese in deep trouble all the time.
The Japanese kept putting up a fight and despite staying close to their rivals, they never looked like walking away with an upset.
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