To investigate the effect of the dietary energy levels on the laying performance of laying hens and the laying performance by strains of laying hens this experiment was carried out for 350 days from 151 through 500 days of age of laying hens with Chuksi 735. Rhode Island Red X White Leghorn. New Hamp-shire X Rhode Ialand Red and Shaver Isoprotein level(15% crude protein) and 3 levels of dietary energy that is ME 2850㎉/㎏ (energy 100%) 2565㎉/㎏ (energy 90%) and 2280㎉/㎏ (energy 80%) were splited into 5 replication. 4 strains(Chuksi 735, RIF X WL. NH X RIR, Shaver) of laying hen were evenly allocated to a dietary energy level. A total of 600 laying hens were used in this experiment and 50 laying hens were allocated to each strain. The results obtained were as follows. 1. Hen-day egg production rate of energy 100%, 90% and 80% was between 65 and 67% on an average and decreased as the dietary energy levels decreased. However there were no statistical differences between treatments on the hen-day egg production. In the hen-day egg production by strains of laying hen. Shaver produced 73% of egg on the basis of the hen-day egg production and was greatly (P$lt;0.01) highest among the strains of laying hen 67% of Chuksi 735 was next and significant (P$lt;0.01) differences were found out between strains of laying hen. 2. Egg weight from hens on 3 energy levels of 100%, 90% and 80% was 57.5g on an average and was not affected by the energy levels. In the egg weight by strains of laying hen weight of egg produced by Shaver and Chuksi 735 was significant (P$lt;0.05) heavier than that of egg produced by cross strains. 3. Diet intake was progressively decreased as the energy levels increased. Hen fed energy 100% consumed significant (P$lt;0.05) less feed than hens on energy 80%. In the strains of laying hen Shaver and Chuksi 735 of light body weight consumed significant (P$lt;0.01) less feed than cross strains of heavy body weight. 4. Feed required per ㎏ egg production generally was 3.12㎏ to 3.45㎏ and was progressively higher as energy levels decreased. However, there were no significant differences between treatments. In the strains of laying hen, Shaver and Chuksi 735 of light body weight required significant (P$lt;0.01) less feed per ㎏ egg production than cross strains of heavy body weight. 5. In the hen-housed average egg production by strains of laying hen, Shaver produced 247 of egg and was greatly (P $lt;0.01) highest among the strains of laying hen and 231 of egg of Chuksi 735 was next. 6. In the first day of 50% egg production by strains of laying hen, Shaver and Chuksi 735 were slightly (P$lt;0.05)earlier than cross strains of laying hen. 7. In the economical analysis, crude income per hen was lower with hens on high energy level than those on low energy. 8. Therefore according to this experiment, it may be concluded that laying performance was not affected by the dietary metabolizable energy levels between 2565Kcal and 2850Kcal per ㎏ of feed. In the strains of laying hen. Shaver was the highest for the laying performance and next for Chuksi 735.