A composite system was fabricated by using epoxidized soybean oil. The fiber volume fraction in the composite system was determined to be 47-51%. Environmental testing of composite samples showed that from 25 to 50°C, the tensile properties of the composite remained constant, but the flexural properties decreased. After being soaked in water and dried out, composite showed a decrease in stress, but an increase in modulus. Experiments with different curing agents showed that the glass transition temperature can increase to 65°C.