Abstract: For overcoming the difficulty of getting hydrolyzed potato starch and making the isozyme analysis with starch gel electropboresis to be easily undertaken, a chemical potato starch (or food potato starch )mixed with soluble starch and some additives was used instead of hydrolyzed potato starch to make gels. The result shows that cooked with 8-- 10/100 of the above mixed starch (in proportion as 5∶3), adding 1/100 agar powder and 2-4/100 sucrose, the "compound starch gel" can be perfectly sliced and stained for many enzymes, such as PGM ,PGI,MDH, AAT, SKDH, 6PGD,IDH,ME etc. for varied kinds of plant materials.