To click on the color palette and drag to the model is too inconvenient.
How to pick color from model simply like in Photoshop?
Press the C key. 
Thank you very much.
But now I have another problem
.
When I choose darker color on the color palette, I often click to the outer frame color. And the present color pointer is a square, it is not precise. So I can’t choose the darker color I need.
The other color palettes in the “modifiers” have the same problem.
Ok, press Color>SysPalette. This gives you Windows’ color picking system.