Hello I using FreeRTOS with TI ARM Cortex-R4F RM48 and keil. But I do not see any project that using ARM Cortex-R4F with keil in Demo document. So I want to ask how to transplant FreeRTOS to ARM Cortex-R4?

Which compiler are you using with Keil? If it is the ARM compiler then you will probably need to actually create a port yourself. If it is GCC or the TI compiler then you will have a good starting point with what is already in the FreeRTOS kernel download. TI also provide an R4 port of FreeRTOS that supports the MPU in their HalCoGen tool (at least they used to) – does that generate projects for the ARM tools?

I using keil4, but FreeRTOS does not compiler with keil4. So I will be use keil5. Is there a project that can be referenced?

Keil is the IDE, not the compiler, you can use it with both the ARM and GCC compilers – may be others too.