It is still necessary to use animals for food, clothing or medical research. Nowadays, animals are widely used in many areas. Some people think it will be unnecessary to use them in the near future. I tend to disagree with this idea since although animals can be replaced by many new technologies in the certain field, such as clothing, humans still need to use animals for food or medical research. We do find a lot of alternatives to animals. Some scientists use soybeans to create new types of food which are tasted like meat. So, many vegetarians who eat these foods can acquire enough protein in daily life. Meanwhile, a few animal protection institutions claim vegetarian diets can be as healthy as normal ones. Researchers from Peking university tried to find a way to use simulation in computers to replace drug tests on animals. It true that some drug tests are really cruel, and we have no moral right to take animals’ lives. Moreover, using wild animals’ fur to produce clothes is banned by most countries. However, it is nearly impossible to replace animals everywhere. Meat eaters argue that it is really hard to have a balanced diet without meat because meat analogs are usually expensive and hard to find in markets. Meat is traditional food in many religions and countries. It is unfair to ask some people to give up their customs. In addition, medical tests on animals are more efficient and convenient. Some useful drug cannot be waited for a long experiment process, because they are related to many patients’ lives. At that time, sacrificing animals is necessary. In summary, we need to respect animals’ right and reduce to use them for our vanity, while we cannot avoid to utilize them because of cultural or scientific reasons.