By integrating of nanowire technology with surface acoustic wave(SAW) technology and taking the advantage of high specific surface area of nanowire gas sensitive materials and high mass sensitivity of SAW sensor,a new generation SAW gas sensor has been developed.The sensor has the advantages of fast response speed,high sensitivity,small bulk, small weight and easy to integrate.Four aspects of sensor including developing of special SAW chip,developing of special nanowire,research of special nanowire surface decorating and modifying,detecting circuit designing are presented in this paper.The simulation results indicate that comparing to conventional 2D structure SAW gas sensor,the 3D nanostructure SAW gas sensor′s sensitivity and response speed are greatly improved.