Whould you please help me to find the answer of question about ADIS16266 and EVAL-ADIS.
The EVAL-ADIS was not intended to support such testing, so we do not have any official tools for this purpose. Having said that, we have done some reference design work, which you might find helpful. We actually designed three different boards, which drove the SPI communication signals, rather than the USB (as you asked about) through the slip ring. I will dig up the links to these reference designs and post them in separate comments.
Please see this link for an overview of how we accomplished this type of testing for another product in this family, the ADIS1648x. While this is a different product, the communication needs are very similar, so I suspect that you could use these design files as a starting point for an interface that would help you drive the SPI lines through the slip ring in your motor stage.
I hope that this helps!