[Objective] The research aimed to establish a kind of rapid and effective method for detecting the enzyme-digested products of restriction endonuclease by using capillary electrophoresis.[Method] With methyl cellulose(MC) as sieving matrix,PBR322/BsuRⅠDNA Marker was taken as test object to study the effects of the concn.of the sieving matrix,pH value,the capillary column temperature and electric field intensity on separating small double-chain DNA fragment by using capillary electrophoresis and seek the opt...