Water-saving and drought-resistance rice is a new type of cultivated rice with high yield, good quality and water-saving and drought-resistance characteristics. Huhan 7A is an indica type three line male sterile line bred by Shanghai Agricultural Biological Gene Center and Shanghai Tiangu Biotechnology Co., Ltd. with Wuxiang B/Neixiang B//Huhan 1B as parents, through a multiple crossing system breeding. It has the characteristics of stable fertility, strong drought resistance, good grain quality and good combining ability. The water-saving and drought resistant rice combinations, such as Hanyou 73 and Hanyou 3015, selected from the parents of Huhan 7A, have shown strong hybrid advantages and have been widely used in production. This paper introduced the characteristics of Huhan 7A, analyzed and evaluated the growth period, resistance and yield of its hybrid combinations, and put forward the precautions and improvement directions when using Huhan 7A, to provide scientific basis for the application of Huhan 7A as the core parent of water-saving and drought-resistance rice.