Currently, the use of synthetic chemicals to control pests of stored products raises many concerns relationship to environment and human health. So, researchers are looking for alternative is to good efficacy and environment friendly. In this research, Repellent activity of five terpenoid compounds including: carvacrol, myrtol, menthol, camphene and Alfa-pinene were investigated on Tribolium castaneum and T. confusum (Coleoptera: Tenebrionidae). Y shaped olfactometer was used to study the repellency effects. results show that, As the concentration increased, the rate of repellency increases and in the highest concentration (21.92 and 20.10 µl) alfa-pinene caused 80 and 60% repellent effect on T. confusum and T.castaneum, respectively. Also in this test, carvacrol, myrtol, menthol and camphene at concentrations of 46.22, 54.67, 23.55 and 20.98 µl caused 53.33, 40, 53.33 and 60% on T. confusum and at 45.19, 52.81, 21.15 and 20.78 µl caused 46.67, 40, 53.33 and 40% repellency on T. castaneum. Results showed that among tested terpenoid compounds, Alfa-penine has the most repellent on species two of T. confusum and T. castaneum. Also, these tested terpenoid compounds including: carvacrol, myrtol, menthol, camphene and Alfa-pinene have repellent activity on T. confusum more than T. castaneum. although from an economical point of view synthetic chemicals are still more frequently used as repellents than essential oils and its ingredient compounds, these natural products have the potential to provide efficient and safer repellents for humans and the environment. The used of ingredient compounds as one of the components in IPM programs which may reduce the application of synthetic chemicals.