Abstract: Based on the improved technique of polyacrylamide gel electrophoresis (PAGE), researches were carried out to examine the albumins of 7 varieties of sweet corn hybrids. Results showed that sweet corn seed albumins existed in some polymorphism, which made up unique albumin PAGE “fingerprint” for each variety. The examination of the seed purity of 7 different sweet varieties was carried with this technique, while field test was done. By related analysis of the purity of PAGE and field test of 5 hybrids, the result get to the marked level in statistics(r=0.9408), which showed that the improved technique of polyacrylamide gel electrophoresis (PAGE) used to test the seed purity is feasible and can be applied to identify the purity of sweet corn hybrids.