The experiment of solid-carburizing process on 20 steel and 20CrMoV steel has been fully developed,which includes prepartory heat-treatment,carburizing craft,metallographic structure,the final heat-treatment,etc.This experiment analyzed the factors of carburizing coating and hardness,and the basic law and technology of solid-carburizing process have been worked out.The experiment has proved that solid-carburizing craft has several advantages such as simple process,easily to operate and control,low cost,and without spcial devices.The solid-carburizing product completely meets conventional requirement.However,solid-carburizing process has its disadvantages such as thin carburizing coating and too long totl operating time,thus solid-carburizingonly fits for ghe production of single-piece on small scale.