after i downloaded the macOS Sierra, i used clover to Macintosh SSD and choose the same option of legacy boot
but when i launched EFI-Mounter v3, it appears only EFI of USB
i have copied the EFI folder of usb to Macintosh SSD/EFI manully
then when i reboot the image appear, i must put usb in the same socket to boot to the system.