Abstract: To study the effects of GA3 on breaking seed dormancy and plant growth in eggplant, the germination and the plant growth were investigated with 16 inbred lines and 2 varieties. The result showed that, the seed germination rates were low and had statistical significant differences in all 16 inbred lines one month after extracting from fruit, which the maximum germination rate was 25.5%, and the minimum was 0%. It illustrated that all inbred lines had dormancy, but varied in degree of dormancy. Compared with that treated by water, it was also found that germination rate and potential of all 16 inbred lines increased significantly after treating by 1000 mg/L GA3, and the germination rates of six inbred lines were greater than 90%. It showed that GA3 had significant effect on breaking the seed dormancy of eggplant. When storaged in dryer for 4 months, the germination rates of 14 inbred lines were greater than 90% while only two (06036 and 06039) originated from north of China were less than 80%. In addition, seedling height, agronomic characters in the field and yield of two cultivars of commercial eggplant (‘Nongfu’ and ‘Qingfeng’) were investigated after seed treating with GA3. The results indicated that the seeding height of ‘Qingfeng’ increased significantly treated by 2000 mg/L GA3 in one leaf stage, and there were no significant difference by lower concentration of GA3 on ‘Qingfeng’ and all treatment on ‘Nongfu’. After planting in the field, the plant height, stem diameter, the length and width of leaf, and the fruit weight, fruit length, deformed fruit rates and yields had no significant changes after seed treating with GA3 on two cultivars. It also showed that there was no significant effect on plant growth, fruit traits and yield between 4 h and 6 h of seed treatment with GA3. These results showed that seed treatments with GA3 could contribute to improving germination, but had no effect on plant growth and yield after 4 leaves on eggplant.