Accessibility varies in China depending on where you are. Things are improving every year but given the vast size of China and varying rates of growth, you may find old areas are a lot more difficult to travel through than modern cities. In Shanghai, for example, most public transport is wheelchair-friendly, as are a lot of the sites, whereas Beijing is a lot more difficult to navigate.
In Chinese culture, disability has traditionally been seen as something to overcome rather than something to accommodate, which has hampered efforts to improve both cultural acceptance and access. This is changing, which is fortunate not only for travelers, but also for the 80+ million Chinese people living with physical and mental limitations.
If you do live with a visual, hearing or other impairment, let your booking agent or group leader know early on so they’re aware and suitable arrangements can be made. As a general rule, knowing some common words in the local language, carrying a written itinerary with you and taking to the streets in a group, rather than solo, can help make your travel experience the best it can be.