This paper reports study on production factors such as type of condenser, the cutting-up of the branches and leaves, and their degree of dryness to determine how they affect the yield and quality of oil, in the process of cassia oil production.It was demonstrated that the oil yield was markedly affected by the type of condenser. Optimal conditions for distillation were to use N3 condensers, with semi-dried raw materials cut up in one-centimeter long pieces. The yield of oil was 1. 37 % , which had an aldehyde content of 90 %, while the type of condenser, how the branches and leaves were cut and their states of dryness fundamentally did not affect the aldehyde content.