I briefly describe the steps what I have done, maybe usefully for others.
My KDS run time environment is Linux.
.Directly merge "Hello world" from CW10.5 to KDS based on K60.
1: Create new project based on K60 from KDS.
2: Remove all files from this project.
3: Link this project to K60 "Hello world" prjoect.
4: Copy EWL GCC support from CW10.5, CW10.5 "Hello world" project need this.
5: Add head include directory for this project and nostdinc gcc compile option.
6: Explicit add project link file location and path.
7:Add EWLlib link path, and -lm -lc -lgcc -lhosted, -luart, -lrt, add -nostartfiles, -nodefaultlibs, -nostdlib, link options.