This study was conducted to investigate the influence of seedling age and plant density on the yield and yield components of perilla intercropped and aftercropped with tobacco. 1. In this experiments, tobacco (Hicks) was employed as a intercropped, and perilla(Suwon 8) as a inter or after cropped. 2. Three levels of 20, 30, 40 days of seedling age and 3 levels of 1, 2, 3 seedling per a hill of planting density was employed in this study. 3. As a result of this study, it may be concluded that 30-40 days of seedling age and 2-3 seedlings per a hill was most effective in the case of inter and aftercropping perilla with tobacco.