Their data shows that 311,200 ebook readers were sold in China during the second quarter of 2011. Hanvon dominate the market with 64% of sales (by volume), followed by Shanda (13%), Aigo (4%), Teclast (3%) and Newman (1%).
A couple interesting details about the number:
Shanda only launched their ereader late last year and they've already gained a sizable market share. The Bambook is a rather odd looking 6" ereader running on a Marvell CPU, and it apparently has more appeal than I thought.
The other interesting detail is that Chinese ereader market is so small that Amazon, B&N, Kobo, and Sony each sell more devices. (I'd like to add Pandigital and E-Fun to the list but they've transitioned to Android tablets so the comparison isn't apt.) Now that is a tiny market.