Taking a case of the rice at the Yongqing experimental site in Pu’er City, a study was made on the water demand for rice and irrigationquota. Based on the experimental results and the meteorological data at the Yangqing Station during 1970-2014, the water demand for rice andirrigation quota in the various hydrological years were obtained. It was found that the average of ET0 in Pu’er region start decreasing from ricereturning green stage, which reach minimum in heading and flowering period, and then continually increase. There is a significant positivecorrelation between daily ET0 and sunshine hours (p=0.001), and negatively correlated with relative humidity (p=0.014). The average daily ETc ofrice and ET0 were in the same trend, but also minimum in the flowering stage, and maximum in returning green stage, which is a big difference fromother areas. The crop coefficient of rice in whole growth period is 1.11. The ETc in wet year, normal year and dry year are 548.2mm, 589.8mm and606.7mm respectively, and the irrigation quota of rice in wet year, normal year and dry year are 282.5 mm, 350.5mm and 378.8 mm respectively.