【Objective】The dynamic changes of ROC22 water requirement and its relationship with meteorological factors were studied, in order to provide data support and theoretical reference for formulating scientific and reasonable irrigation system and investigating effect of climate change on sugarcane water requirement.【Method】Using sugarcane variety ROC22 as material, the sugarcane water requirement, soil evaporation capacity between plants and leaf transpiration were measured during growth period in 2012 and 2013 by soil pit method. Then a-value and modulus coefficient were calculated to draw relation curve of sugarcane water requirement and yield. And the temperature, air humidity, evaporation capacity, rainfall, wind speed, sunshine hours and other weather indicators were determined by test-pit experiments of meteorological station. Then using DPS software, the correlations between sugarcane water requirement and meteorological factors were analyzed. 【Result】The results showed that, the sugarcane water requirement, soil evaporation capacity between plants and leaf transpiration increased firstly to peak values, then decreased gradually. And the water requirement at elongating stage was the highest, followed by that at tillering stage, then the lowest at mature stage. Moreover, a-value and modulus coefficient were lower from March to April and from September to November, and higher from June to August. And sugarcane yield increased linearly with the increase of water requirement and leaf transpiration, but the soil evaporation capacity between plants was't significantly correlated with sugarcane yield. During growth period of sugarcane, the air temperature, ground temperature and evaporation capacity presented parabolic change trend. In addition, the sunshine hours, wind speed, relative humidity, absolute humidity showed fluctuant decreasing trends, and the saturation deficit changed more smoothly in 2012, but which changed in greater range in 2013. Furthermore, the sugarcane water requirement was extremely significantly positively correlated with air temperature, ground temperature and evaporation capacity (P<0.01 ), and positively correlated with sunshine hours, absolute humidity and saturation deficit to varying degrees, but the correlation wasn 't significant (P>0.05 ), while not obviously correlated with wind speed and relative humidity.【Conclusion 】The sugarcane water requirement shows a single-peak curve, which is lower at seedling stage and mature stage, but higher at intermediate elongating stage. And the sugarcane water requirement is significantly positively correlated with sugarcane yield. Furthermore, the sugarcane water requirement is influenced by climatic conditions, especially air temperature and ground temperature with the most influence.