Ice cream is an attractive and delicious frozen dairy product. Nearly 800 years ago, ice cream originated in China. The expansion rate of hard ice cream is 80%- 100%, and it is hardened to facilitate packaging and transportation. Created by Italians, it is mainly processed in factories and frozen in shops, so it can be seen from the appearance that it is hard and the ice particles inside are very thick. Soft ice cream has no hardening process in the production process, and the expansion rate is 30%-60%. Generally, it can be made and sold by an ice cream machine. Generally, a soft ice cream contains more nutrients (about 1.6 times) than a hard ice cream with the same volume. Soft ice cream without hardening will also be more creamy and mellow. Soft ice cream was made in the 1930 s by Joseph of England? Lyons Food Company invented it. Margaret Thatcher, a former British prime minister who worked as a pharmacist in the company at that time, also participated in the research and development of soft ice cream emulsifier.