the name of the bird is White-breasted nuthatch. (五子雀 )
The size of a sparrow, the White-breasted Nuthatch is blue gray above and white below with a black crown with a long bill and a short tail. Nuthatches spend most of their day running up and down tree trunks, searching diligently for insects and larvae hidden in the barky crevices. They are often called "upside-down birds", since they probably spend most of their lives in that position.