Jute fiber mat reinforced unsaturated polyester matrix composites having different fiber weight contents (11, 22, 32 wt%) were fabricated by modifying the hand lay-up technique with resin pre-impregnation into the jute mats in the vacuum. Tension and three-point bending tests were carried out to evaluate the effect of fiber contents on these mechanical properties of above-mentioned composites. The results show that as the fiber weight content increases, Tensile and flexural properties (strength and modulus) increase. Fiber pull out mechanism is the predominant failure mode revealed at the fracture surfaces under tensile load as well as at tension side of composites under bending load.