Due to the wide and effective use of sucker controlling chemicals, gentic studies on the suckering habits of tobacco plants have long been neglected. So, to investigate the genetic basis of suckering, crosses between "Little Dutch" and "Cuban" were made, and subsequent generations, $F_1F_2,;BC_1,;BC_2,$ and parents were grown on the field. Several morphological characters were measured and the relation among them were analyzed. Correlation coefficients between leaf shape and sucker leaf shape, and the number of suckers and sucker weight were 0.25 and 0.42, both sighificant at 1 % level. But negative correlation between number of suckers per plant and that of leaves was observed, though statistically not significant. Dominance was observed in the number of suckers and amount of suckers produced, and the heritability of sucker shape was calculated as high as 0.88. And two paris of genes seemed to be involved in the inheritance of sucker shape, and narrow leaf appeared as dominant in the $F_1$.inant in the $F_1$.