Gel electrophoresis was conducted for the exploration of isozyme markers and studies on the correlation between isazyme markers and some characters of 35 clones of sweet potato (Ipomoea batatas (L.) Lam). Enzymes such as diaphorase (DIA), malate dehydrogenase (MDH), phoshporylase (PP) and peroxidase (PX), which indicated polymorphisms, were included. Two types of polymorphism were noted in DIA, and three in MDH. Presence and lack (or weak) of activity in PP were also observed. Zymograms of PX were divided into 6 distinct zones for classification. At least 2-4 variants were found at each zone. Cluster analysts basest on genetic similarity of zymotyps was done. Some degrees of diversity were noted among accessions even from the same origins. Correlations between zymotypes and some quantiative trails (marketable root number, marketable root weight, cull root number, call root weight, fresh weight of tops), and chemical composition of storage roots (contents of dry matter, protein, sager, starch and fiber) were studied. From tingle factor ANOVA test for each enzyme zone to each measured trait, it is indicated that same zymogeams were significantly correlated with some quantitative traits, i.e. DIA, and top fresh weight, PXA1 and dry matter of storage roots, PXA2 and sugar content of storage roots. PXA3 and sop fresh weight, and PXA4 with the most characters (cull root number, cull coat fresh weight, tsp fresh weight, protein, sugar and fiber contents of storage roots), Therefore, it is suggested that GIA and PX zymograms of sweet potato leaves may be utilized in selecting breeding lines with less cull coot number, less top fresh weight, higher dry matter, protein and sugar contents of storage roots in the early stage of breeding. It deserved further research to increase breeding efficiency of sweet potato.