The paper presented herein dealt with studies on genotype-environment interaction following genetic approach for grain yield and different sink characters in seven crosses (Balaka x Pavon, Gourav x Kanchan, Kanchan x Sonora, Gourav x Protiva, Kanchan x Pavon, Kanchan x Pavon, Sonora x Pavon) of spring wheat grown at BAU in the winter season of 2005. According to G x E interaction study on crosses genotype, environment and GxE interaction were significant for all the characters. Relative contribution of different parameters such as additive [d], dominance [h], environment ej, additive x env. gdj and dominance x env. ghj were determined for all the five characters studied. Most of the crosses for yield/plant showed incomplete dominance, while one cross (Gaurab x Protiva) showed overdominance of increasing allele and another one (Balaka x Pavon) showed overdominance of decreasing allele. The expression of heterosis for yield per plant in Gaurab x Kanchan was done away within adverse environment. Profound environmental effect was observed for days to 50% flowering, number of spikelets per spike, number of grains per spike, yield per plant and 100- grain weight. In general, hybrids were more reactive to the changes of environment than their parents for all the characters studied.