Using plane dislocation theory and the seismic-wave inversion results from the Institute of Geophysics,China Earthquake Administration and the Institute of Geodesy and Geophysics,Chinese Academy of Sciences models,the surface coseismic deformation and gravity changes caused by the 2013 Ms7.0 Lushan earthquake are simulated.The simulations of coseismic gravity change and deformation indicate that the dislocation has dip-slip characteristics.The results also show that the coseismic deformation exhibits a symmetrical,positive-and-negative distribution,with the deformation usually being less than 10 mm in the farfield but up to 140 mm in the near-field.The gravity changes are concentrated on the fault-projection area,which is greatly affected by the vertical surface deformation.The gravity change and vertical deformation in the far field are usually less than and 5 mm,respectively,but reach and 330 mm,respectively,in the near field.The simulated results agree well with the measured results,which suggests a theoretical basis for the observed change in gravity before and after this earthquake. Using plane dislocation theory and the seismic-wave inversion results from the Institute of Geophysics, China Earthquake Administration and the Institute of Geodesy and Geophysics, Chinese Academy of Sciences models, the surface coseismic deformation and gravity changes caused by the 2013 Ms7.0 Lushan earthquake are simulated. The simulations of coseismic gravity change and deformation indicate that the dislocation has dip-slip characteristics. the results also show that the coseismic deformation exhibits a symmetrical, positive-and-negative distribution, with the deformation usually being less than 10 mm in. the far field but up to 140 mm in the near-field. The gravity changes are concentrated on the fault-projection area, which is greatly affected by the vertical surface deformation. gravity change and vertical deformation in the far field are usually less than and 5 mm, respectively, but reach and 330 mm, respectively, in the near field. The simulated results agree well with the measured results , which suggests a theoretical basis for the observed change in gravity before and after this earthquake.