Abstract:Comparison of the data measured by four kinds of digital levels,and a optical level Ni002A,based on same piles shows that:1)There is not obvious systematic measurement deviation in the digital levels relative to the optical level Ni002A;2)Bar code level rod’s length correction f value must be corrected in the practical leveling measurement;3)SDL1X、DiNi03 and DNA03 style of levels can be used in the onegradeleveling measurement,and DL101C can be used in the twogradeleveling measurement only.