Most Shiite Chinese are considered Hui and many practice Taqiyya
or religious dissimulation (basically they pretend to be Sunni in
public) in order to avoid persecution. The Chinese government has
often not been friendly with Shiite Muslims, believing them to be
responsible for Muslim-on-Muslim Wars in Xinjiang (while, the
Chinese government mistakenly believes that the Sunni Ghalchas and
Uighurs are innocent in this matter). As a result, numbers are
quite hard to come by.
In terms of general information, most Chinese Shiites are the
Ismaili Tajiks of the Tashkurgan and Sariqul areas of Xinjiang. The
Shias of the Imami branch are numerous in Yunnan and Guangxi
provinces. Additionally, there are some Shiites who are recent
immigrants from Iran, Lebanon, and other countries with large
Shiite populations.