Approaching the fuzzy problems that Case Based Support system often face，this paper presents a kind of case based support systems using fuzzy neural technology(FNCBSS)．As a kind of intellignet decision support systems，because it has fuzzy logic inference and learning functions，it is more similar to the mental cognitive process of mankind．The paper gives and analyses the principle strcture of the FNCBSS and also points OUt its fessibilities from the theorical perspective and the difficulties it will hoe in appfication．In the end．it discusses the future of the FNCBSS developement．