What types of power plugs do they have in China? Do I need to take a plug adaptor with me when I travel in China?

China's common power plug types are Type A, Type C, and Type I.

A type A plug has two flat, parallel prongs.

A type C plug has two round pins. A type I plug has three flat pins, of which two oblique blades form an inverted V-shape and the other has a verticle grounding blade arranged in the middle – it looks like the character 个 (gè) in Chinese.
So if your home country has different plug types with China, make sure to pack a universal plug adapter to stay charged.