I have a question about building a project which base on Arduino Zero. Is there any way to can take the essential part of circuit from Arduino Zero board and implement it on other place? Any example or reference?
You mean the SAMD21 processor?
yes. It looks like that the chip can make the project small.
Take a look at the Zero design files. There may need to be supporting circuitry. I believe it needs a smooth 3.3V power supply.