Since the boot code locates in the bottom of embedded system, so the design of boot code is the key technology and the important steps of system development during the development process of embedded system. Although the boot code supporting new framework has been updating, the boot code of manufacturer giving is an old version of a few years ago in the current market popular embedded products. So this paper analyzes the U-boot code commonly used and in the popular in detail, combining with the startup process of embedded Linux system, then, this paper gives a process, transplanting the new version of U-boot code using the UT6410 as development platform. On the basis of completing the basic function transplantation, this paper adds the network card and DNW. Experiments show that the new version of transplantation can run smoothly, and improve the efficiency of the system.