Abstract: The sowing date influences lodging resistance of maize. This paper described the types, degree and the mechanisms of lodging under late sowing dates. A field experiment was conducted to investigate the lodging types, degree of lodging and morphology and mechanical properties in the internodes of spring maize under late sowing dates. The results showed that compared with the maize of non-late sowing dates, lodging was severe under late sowing dates. Stem loading was the most affected type. The main breaking sites of stem lodging was from second node to seventh node, especially in third and fourth node. The plant height was significantly reduced (p<0.05, the same below), while the height of ear and the spike position height coefficient was significantly greater. The diameter in the second, third and fourth bending node was significantly lower, while the length of second, third and fourth node was significantly greater.