Abstract: 【OBJECTIVE】To development of a novel simulation model for dynamics of cotton height and diagnostic indexes and prediction method for cotton high yield production. 【METHOD】 Cotton plants height data collected from six sites of super-high-yield trails in two years were analyzed by date-plant height method, leaf number-plant height method and leaf number-relative plant height method, respectively. 【RESULTS】The results showed that the novel model based on leaf number-relative plant height had a wide applicability and possessed a high precision. And diagnostic indexes based on the new method were applicable and flexible. The new plant height prediction method was simple, practical and reliable. 【CONCLUSION】 leaf number-relative plant height method was not only suitable for cotton plant height prediction and diagnostic indexes determining, also could be tested extensively to other crops.