Here is my collection of Caucasoid DNA data in Han Chinese. Keep in mind these Caucasoid DNA were not neccesarily contributed by Caucasoids such as the Persians, Tocharians, Arabs, Sogdians. The Turkic people (Half mongoloid), Uyghurs, especially the Kaifeng Jews and Hui also would have played an large role. The ethnic Hui are descendants of Central Asians, Persians, Arabs who intermarried with Chinese. They have 6.7% - 7% mtDNA T1, T2 and 30-42% R1a, R1b, J2, G2c The Kaifeng Jews were descendants of Jews who had intermarried with Han Chinese, due to marriage with Han Chinese they are physically indisguinshable from the locals, many also assimilated into the Han population and lost their idendity.
West Asian/Central Asian males married with Han Chinese
" the Ming administration instituted a policy where all West and Central Asian males were required to intermarry with native Chinese females, hence assimilating them into the local population. "
Iranian/Arab/Turkic/Sogdians married with Han Chinese
" Iranian, Arab, and Turkic women also migrated to China and mixed with Chinese. Iranian women as dancers were in demand in China during this period. During the Sui dynasty, ten young dancing girls were sent from Persia to China. During the Tang dynasty, bars were often attended by Iranian or Sogdian waitresses who performed dances for clients. "
Hui men/women married with Han men/Han women + Uyghur men/women married with Han men/Women
" Han women who married Hui men became Hui, and Han men who married Hui women also became Hui. In 779 the Tang dynasty issued an edict which forced Uighurs to wear their ethnic dress, stopped them from marrying Chinese females, and banned them from pretending to be Chinese. The magristrate who issued the orders may have wanted to protect "purity" in Chinese custom. Han men also married Turkic Uyghur women in Xinjiang from 1880–1949. Sometimes poverty influenced Uyghur women to marry Han men.
Caucasoids haplogroups in Chinese
Caucasoid mtDNA W, T1, U2, J, K, HV, JT, UK ect
Hong Kong 1.34%
I have no data on Caucasoid mtDNA in other Chinese province and city.
Caucasoid Y-DNA R1a, R1b, J, T, E3b1b1, G2a, H1b ect
49 samples 3.8% R1b1c
34 samples 0%
39 samples 5.2% J2a and R1b1b
19 samples 0%
50 samples 0%
20 samples 10% R1a1
27 samples 0%
15 samples 0%
18 samples 5.6% J1
107 samples 0%
58 samples 0%
45 samples 17.7% R1b1, R1a1, G2c
25 samples 9.8% G2 and R1a
23 samples 4.3% R1b
57 samples 0%
40 samples 2.5%
13 samples 0%
14 samples 7.1% J1
58 samples 0%