Grapevine is one of the most important small fruit crops in Iran and the world. The grapevines are considered as moderately sensitive to salinity stress.This study was done to assess the salt tolerance of six grapevine genotypes under in vivo conditions. For this purpose, one year pot plants of six grapevine genotypes (KeshmeshiGhermezGhazvin, Asgari, YaghootiSefid, RishbabaSefid, Siah, and Shahani) and NaCl at 0, 30, 60 and 90 mML -1 were used. The experiment was caried out as a factorial (4 × 6) based on completely randomized design with four replications.The results showed that salt stress significantly reduced the most of the vegetative growth prameters including fresh and dray weight of root and shoot, stem length, root number and length. With increasing salinity levels, the ratio of the necrotic leaves to total leaves ( N/T ) was increased. The results also indicated that there was significant differences between the used genotypes in the experiment .The lowest means of shoot fresh weight was related to the Asgarigenotype and the highest root fresh weight was recorded in Keshmeshighermezghazvine, Shahani and rishbabasefid genotypes. The highest ratio of the necrotic leaves was related toSiah, Asgari and also yaghootisefiedgenotypes. Yaghootisefied and Keshmeshighermezghazvinegenotypes showed the highest increase in stem length and the lowest root length means was related to Asgari and yaghootisefied genotypes. Root diameter in this experiment were not affected by salinity and the most root numbers allocated toSiah and Keshmeshighermezghazvinegenotypes.With increasing salinity in leaves increased electrolyte leakage percent and the lowest means was related to Keshmeshighermezghazvinegenotype. In all genotypes, and at all NaCl levels, the chlorophyll fluorescence index significantly decreased, but the Shahani andKeshmeshighermezghazvinegenotypes expressed the highest means of the this trait. In most of genotypes, the content of proline in leaves wereincreased with increasing the levels of salinity. The highest rate of proline in leaves was recorded in Siah genotype and, the lowest rate was measured in Asgari and yaghootisefiedgenotypes. With increasing the NaCl levels, accumulation of potassium and sodium in leaves of all grapevine genotypes were increased such that Asgari, Siah and rish baba sefied genotypes had the highest mean content of potassium and the highest mean content of sodium allocated to Siah, yaghootisefied and rishbabasefied genotypes. With increasing salinity levels, root sodium content in all genotypes was increased while a decrease of potassium content was determined in the same part. Genotypes, Siah, Rishbabasefied and Asgarihad the lowest root potassium mean and the Yaghootisefiedand Shani showed the lowest sodium accumulation in their root tissues. With increasing salt concentration the potassium content of stem tissues decreased,