High order nonclassical properties of the squeezed vacuum state,such as high order squeezing,high order anti-bunching,and the second order sub-Poissonian photon statistics,are investigated.The effects of the squeezing parameter on these nonclassical properties are discussed by numerical calculations.The results obtained show that it displays high order squeezing and the fourth order anti-bunching,and they are all strengthened with increase of the squeezing parameter.On the other hand,it does not display the first,the second,the third anti bunching,as well as the first and the second order sub-Poissonian photon statistics.