Abstract: In order to evaluate the adaptability of different oil sunflower varieties to saline-alkali soil in He Tao area of Inner Mongolia,twenty one varieties of sunflower from domestic and abroad were chosen to cultivate on saline-alkali in the irrigated area. The main agronomic traits were evaluated by principal component analysis, cluster analysis and stepwise regression analysis.The results showed that the cumulative contribution rate of factors of growth days,plant height,stem diameter,head diameter,their component reached 91.23%, and in principal components classify, the first category was individual factor,the second was the factor of yield component,the third was single head factor,the fourth was growth period factor. In the cluster analysis,when the threshold value was 1 280,twenty one of varieties were divided into three categories,the first category contained 7 varieties with the performances of moderate-late-maturity,black seeds,strong haulm, larger disc diameter, and the rate of seed kernel was more than 70%,the 100-seed weight was 6g. A total of 11 varieties belonged to the second category, and the performance trait were early maturity, short stem,leaf upword,stem stocky,dense planting,grain black, the rate of seed kernel was more than 70%, 100-seed weight was 7g. The third category contains 3 varieties and were characterized by early maturity,short stalk,high seed setting rate. In stepwise regression analysis, significant linear effect was observed between the yield and the stem diameter ,disc diameter,single plate grain number,single plate grain weight,100-seed weight and rate of seed kernel.