Abstarct: Nowadays, due to the increasing warming of the earth, environmental issues have received more attention from researchers. The use of natural fibers and green composites has always contributed greatly to composite materials from the past to the present. Basalt fibers are a suitable alternative to fibers such as glass, carbon and kevlar due to advantages such as having a mineral baxse and compatibility with the environment, as well as high strength. The combination of materials in microscopic and macroscopic dimensions increases the strength of composites and creates a hybrid composite. Also, carbon nanotubes have unique physical and mechanical properties that make them one of the ideal reinforcements for strengthening polymer materials. By adding a very small amount of carbon nanotubes to polymers, their mechanical properties are significantly improved. In this research, the effect of adding 0.25, 0.5 and 1 percent by weight of carbon nanotubes to basalt/epoxy composite was done by using the hand lay-up method, and simple tensile test samples were used to validate the experimental results with finite element software. Three-point bending test and buckling test samples were extracted according to the standard. The results of the three-point bending test indicated that the sample with 0.25% by weight of carbon nanotube was the optimal percentage, and the flextural strength, flextural modulus, absorbed energy and interlaminar shear strength have increased. In the buckling test, adding small amount of carbon nanotube on matrix produced the amount of improvement, and the critical buckling force, the maximum compressive force, and the absorbed energy; have increased. Also, the experimental results were validated with the finite element software.