Have you any idea if i can get the spectrum signal of my XBee ? and how I get it ?

Yes, you can if you connect it to a spectrum analyzer.

thank you for you response please what’s the pin to connect it ??

thank you for your response please what’s the pin i must connect and have an idea if can obtain the spectrum in simulation like matlab or proteus ??

You are not going to do this via a Pin. You need to connect the radios antenna port to a physical spectrum analyzer.