Abstract: Four maize genotypes were selected to investigate the pigment and morphology of maize genotypes under low and high P dosage. The results show that the ratios of chlorophyll to carotenoid, purpurin and red pigment for four maize genotypes decrease under low P dose. Those of “7922” and “Ye107” are 0.4 ~ 0.8 times those under high P dose, with much higher decrease than in “178” and “*082”. PAL activity and total flavonoid content increase under low P dose. Those in “7922” and “Ye107” under low P dose are 1.5 ~ 2.0 times of those under high P dose, with much higher variation than in “178” and “*082”. Differences in leaf width and leaf fresh weight in “7922” and “Ye107” are significant between low and high P doses. The same is case for leaf chief venation diameter and leaf number in “Ye107”. Leaf width, leaf chief venation diameter, leaf number and leaf fresh weight is decreased under low P dose. A significant difference is observed in leaf pigments and maize leaf shape among the different genotypes. This implies that “7922”and “Ye107” are somehow sensitive to low P stress, while “178” and “*082” are tolerant to low P stress.