The optimal condition for sorghum flour extraction by dry milling and air jet sieving techniques was studied. Increasing the moisture content of the sorghum seeds prior to milling was established as a crucial step. Experiments were carried out using five sorghum strains of KU 9501, KU 9502, KU 804, KU 630 and KU 439. Before grinding, the sorghum seeds were soaked to increase the moisture content. The moisture content of seeds of KU 9501, KU 9502, KU 804, KU 630 and KU 439 should be increased by approximately 4, 6, 4, 6 and 6% respectively. After milling the seeds were separated into 3 parts namely bran, broken kernels and flour which particle sizes were less than 1000 mu (G). Later, broken kernels were ground and separated by sieving into three fractions namely those with particle sizes more than 200 mu (C), between 100-200 mu (M) and less than 100 mu (F). All the three fractions of broken kernels, bran and G were analyzed for chemical composition. Comparison among the three fractions of ground broken kernels, fraction C had the highest protein content. Among all five fractions, fraction C had the least ash and oil contents but the highest carbohydrate content. The bran had the highest ash, oil and fibre contents but the least carbohydrate content.
