Abstract: Plants vary widely under different environmental conditions. A general kinematic framework of grass leaf growth between different species or genotypes that is variable or has plasticity under different conditions is an important approach to better understanding plant plasticity at the organ level, tissue level, and/or cellular level. The identity of the components of multi-phase kinetic models depends on theoretical considerations that allow reinterpretation during leaf growth processes, as well as growth between subsequent leaves, tiller production and whole-plant growth. During recent decades, physiological and morphological aspects of the kinetic approach provide a series of acute quantitative analyses to investigate the relationship between the regulation of molecular mechanisms and macroscopic results during grass leaf growth. This review introduces multi-phase kinematic models as a new perspective in determining variation in grass leaf growth. The growth plasticity of grass leaves from a multi-phase kinematic perspective is discussed together with its role in some molecular regulations and further potential for molecular biology and grass science of the kinematic modeling approach.