This study was carried out at Sakha Agricultural Research Station during the two growing seasons 1997-98 and 1998-99 to evaluate twelve wheat cultivars and lines under two treatments on wheat yield and its components, some agronomic, technological and viability traits using a split- plot design with four replications. The two treatments were: a- Low input (35 kg N/fad + four irrigations)   b- High input (70 kg N/fad + six irrigations) The low and high inputs were  allocated to the main plots and the genotypes were assigned to the sub-plot. The results showed that the cultivars and lines differed and significantly responded in all studied characters. Also, the high input  treatment outyielded  and surpassed the low  one in all traits except  for1000 kernel weight, germination %, plumule and radical length and crude protein %.  Moreover, the interaction between genotypes and treatments responded significantly in number of spikes/m², grain and straw yields, crude protein %, fat % and crude fiber %. In conclusion, to grow wheat under the high input, the cultivars Sakha 8, Sakha 61, Sakha 69,are recommended. Meanwhile, Giza 164 and Sids 6 are recommended for growing wheat  under low input conditions.