In the sugar water preference adaptation of rats, they were deprived of 24 meals and 12 hours of water to test the rats' preference for sucrose. The principle of the Sugar Preference Test (SPT) is that rodents are born with a strong desire for sweets. When they are provided with two drinking devices containing sucrose solution and ordinary water, they will choose to drink the sucrose solution. . When rodents are depressed, they are less likely to drink sucrose solutions. Therefore, detecting animals' preference for sucrose solutions can be a useful means to evaluate the symptoms of anhedonia and depression in animals.