Power in China is 220 Volts at 50 Hertz. China uses type A and type I plugs. These are usually combined into a single outlet, as seen here. The unpolarized "Type A" double blade plug is on top, and the grounded "Type I" triple blade plug is on bottom. Most outlets will accept European-style "Type C" plugs with no modification.

China uses the standard RJ-11 telephone jack found in Europe and America.

The Chinese double blade "Type A" plug has slightly shorter blades, and no holes.

World Electric Guide - An excellent resource about power outlets in China and around the world.

Adapter Plug Set - If you cannot find one elsewhere.