If you want to read about the History of Armenians in General you can have a look at the key dates here.
As for the History of the Armenians in China, it is way longer in time than ones can imagine.
We should take the time to gather relevant sources and re-organize them however below is only a selection of various articles found over the Internet.
This is what the Wiki page is about
The history of ChinaHay from 5th to 13th Century
One of the many version of the Mamikonians family
More complete sources for the Mamikonians history
The history of Catchik Paul Chater from 1846 to 1926
The history of ChinaHay from 1919 to 1945
The history of the Armenians in Indonesia
The history of the Armenians in Surabaya