FED(Field Emission Display)is a new f lat panel display showing great market potential,on whose fabrication many devel oped countries are doing research.Meanwhile,spacer technology is not only one of the key technologies of FED fabrication but also a meaningfultopic in the field of micro fabrication technolgy.In this paper,the requirements of qualified FED spacers are presented,various spacer fabrication technologies adopted by some r esearch groups and companies in USA and Japan are introduced.