The study examined the impact of modern rice technology on the pattern of income distribution by farm size. The analysis was based on primary data collected through personal interviews from 60 randomly selected farmers-30 farmers from irrigated MV and 30 from rainfed LV rice farms. The study was conducted at Keliakair of Gazipur in 1986. Percentage distribution of net farm income per unit area into quartile groups followed by a graphical presentation (Lorenz Curve) was used to achieve the study objectives. The major findings of the study are :(i) MV rice having irrigation facilities has increased per unit area of farm income of the lower group resulting in a decrease in the income gap between the poorer and the richer groups. The reverse was observed in rainfed LV rice cultivation. (ii) For irrigated MV rice farms the smaller the farm size, the higher was the share of net farm income pe r unit area resulted to a greater equality in income distribution pattern among farm families and (iii) Negatively skewed distribution of net farm income per unit area was observed in rainfed LV rice cultivation.