This paper observes salix deserts barrier along the highway of crossing Kubuqi desert and Batuta salix datebase.Then,according to the observation,make use of the software of Sufer(8.8) for the wind speed flow chart and it systematically analyses the benefit of wind-breaking and sand-binding of salix deserts barrier with roughness length and roughed wind speed.Besides,the research explains the effects of salix deserts barrier for the highway of crossing Kubuqi desert.The result expresses that the half concealment type,even spread type sand salix defend the sand inside the system,wind velocity ratio(V2 m/V0.3 m) of variety along with to salix system of gradual close to curve large;The variety of rough(z0) then compares along with the wind velocity(V2 m/V0.3 m)of the aggrandizement express two kinds of circumstances: When the weald wind velocity is small in rise sand wind velocity,its trend line is a polynomial function,being weald wind velocity is strong while rising sand wind velocity,its trend line is index number function;Defend the sand inside the system at the sand salix,because of sand grain and sand salix takes place collision inside system,sand rate with defend sand system to distribute far and nearly to no longer follow logarithms in brief or is an index number relation,it pole the value appear of distance with increment but motion of wind velocity,because of sand the salix constitute of earth's surface complications to change much,it flows structure and the sandstorm movable layer wind velocity influence of the line to the sandstorm very difficult assurance.