This paper focuses on the influence of ultra-fine fly ash(UFA), which was collected by electro-static precipitators and with airflow classing technology, on the mechanical properties of high performance concrete(HPC). The influences of concrete constituents on compressive and splitting tension strengths at different ages were studied by multivariate regression analysis method. The experimental results indicate the addition of UFA improves the long term mechanical properties of HPC. The bond stress of steel-bar in HPC containing UFA is a little higher than ordinary concrete, shear strength is near to that of ordinary concrete, the strain-stress curve is also similar, but dry shrinkage and creep are lower.