Klay Thompson's back in the States ... but the legend of #ChinaKlay lives on!!

Here's video of Steph Curry mocking his Splash Brother with a hilarious intentional dunk fail in Chengdu -- one of the stops on Steph's Asia tour.

Remember ... the #ChinaKlay phenomenon started when Thompson was unintentionally REJECTED by the rim on his Chinese shoe tour last month.

Now we have this gem from Curry -- who killed it on his best (worst) 360 attempt.

360 DISASTER

Klay lit China on fire with his dance moves too, but #ChinaSteph is giving him a run for his money. 

The day before, S.C. busted out some push-ups on a clear glass panel in a Beijing skyscraper ... and got paralyzed by his fear of heights.