[en] Technologies for the fuel Kernel preparation for HTGR by wet process have been reviewed. Kernel with good sphericity, uniform size and chemical composition can be prepared by wet process. Sol-gel preparation is based on four major steps: preparation of a sol or of a special solution(broth), gelation of droplets of sol or broth to give semi- rigid spheres, and washing and drying of gel droplets, calcination and sintering of these spheres to a high density. After sol drop is formed, gelation may be accomplished by water extraction or ammonia gelation. Ammonia gelation can be accomplished either externally, via ammonia gas and ammonium hydroxide solution, or internally, via an added ammonia donor such as hexamethylenetetramine. Review of general sol-gel process and of specific process condition in the three different processes have been conducted, to establish the basic knowledge and to compare the advantages and disadvantages of the processes