You Do Need power plug adapter while traveling from Switzerland to China.

Here is Why You Need An Adapter

The outlet and plug type used in China are A, C and I and in Switzerland are C and J. This is how they look like.

Switzerland

In Switzerland, outlets of type C and J are in use.

Type C

Type J

China

In China, outlets of type A, C and I are in use.

Type A

Type C

Type I