This study is performed to examine the physical and mechanical properties of concrete with fly ash. Test results show that the unit weights of concrete with fly ash are decreased 1-3% and the highest strength is achieved by 10% filled fly ash concrete with it is increased 7% than that of the normal cement concrete. The ultrasonic pulse velocity is in the range of 3.705~4.204m/s and the dynamic and static modulus of elasticity is in the range of 271×10³~289×10³kgf/cm² and 208×10³~262×10³kgf/cm², respectively. The acid-resistance is increased with increase of the content of fly ash. It is 1.2 times of the normal cement concrete by 10% filled fly ash concrete and 1.7 times by 30% filled fly ash concrete, respectively.