Abstract: The effect of electro-spinning technology to the mechanical properties of nanometer poly(vinyl alcohol)(PVA) fiber mat was researched.The results show that with the rising of voltage,the breaking elongation rate of the electro-spun nanometer PVA fiber mat first increases,then goes down,and the breaking strength increases gradually;the breaking elongation rate and breaking strength first increase,and then drop rapidly as the distance between the spinneret and the receiving screen increases;the breaking elongation rate increases and the breaking strength drops a little at the beginning,and then increases rapidly as the concentration of the spinning solution increases.