Abstract: In order to investigate adaptive response of the camphor (Cinnamomum camphora) trees in NaCl stress conditions and reveal their salt tolerance capability,different concentrations of NaCl were used to treat Cinnamomum camphora seedlings,and stress relative conductivity,free proline and MDA molality of branch numberchanges were measured under NaCl.The experimental results showed that with the extension of time,NaCl concentration,relative conductivity,MDA molality and proline concentration would increase,thus indicating that with the extension of time and the increase of the concentration,NaCl stress would increase.