If my router has no USB port, can I use WiFi to connect my cloud harddisk with router so the other WiFi device?
What exact model is it? Generally, you use a network cable to connect directly to your router, not USB.
My Cloud and My Cloud Home are different devices with different OSes but neither one can connect directly through the WiFi, the basic requirement is Gbe (gigabit ethernet). Neither devices can connect directly to the USB port of a router.
TP/LINK DECO 6E router which model has no usb port but has internet cable port. Thank you for your advice that I can use internet cable to connect my cloud harddisk. Now clear to try one.
i have tried to do the same but no sucess kindly advice 
@yanash
If you are wanting to setup your device then look at the link I provided in my first reply.
