Abstract: Using double layers grow seedlings technology with electric，prevention effect of common diseases and insect pests and growth condition of seedling were researched during period of tobacco seedling.Results showed that grow seedlings with electric had prevention effect of rhizome and air borne diseases.Tobacco seedlings were growing fast.This technology could effectively shorten seedling time and improve quality of tobacco seedlings.But bottom had artificial light or no and concentration high or low of nutrient solution for bicarbonate ion had great influence on prevention of powdery mildew.And the effect on regulation of growth was significant.It had significant effect on prevention of powdery mildew that bottom had artificial light，potassium bicarbonate was added in solution or flue gas CO2 was added in environment during grow seedlings with electric.Upper and lower layers of grow seedlings with electric still could not rid aphid in aphid dense environment.While physical plant protection liquid could effectively control aphids.