Thank you!~
It works for me now!~
I have checked the player setting of the Cesium for Unity Samples project, and find some differences with mine.
All the player settings of my project is using the default one, and i uncheck the “Auto Graphics API”, and delete the OPEN GLES, shows like below.

Also, I changed the Scripting Backend from “Mono” to “IL2CPP”, change the Target Architectures from ARMv7(which is the default one) to ARM64.

Then, it works fine for me!~
Thank you~