What kind of insect is this?

This is a moth. An insect belonging to the LEPIDOPTERA.

There are many kinds of 140 known in China. Adults are usually brightly colored and fly among flowers during the day. Have a developed mouth. Most of the wings have metallic luster, a few are dull, and the body is long and narrow. Some species have swallowtail-shaped protrusions on their hind wings, which are shaped like butterflies.

Below are some photos of moths.

Lepidoptera bipunctata