For the benefit of people who don't have MS Word, your connection diagram is:
Can you explain why you want to send data from one to the other, and then back again? Why not leave it where it started in the first place?
And assuming you have a good reason, on my page here:
I describe how to send data between two Arduinos using SPI. Scroll down to "How to get a response from a slave".
I don't understand this sort of talk, to be honest:
Because received one byte data is going back on to SPI bus again when I send back data from slave.