IQ is the abbreviation of IQ, and it is an index to measure the level of intelligence, usually abbreviated as IQ. Its calculation formula is: IQ = intellectual age/actual age × 100. This calculation method is suitable for children aged 3 ~ 16. The intellectual age can be obtained through a series of surveys, while the actual age is the age obtained by subtracting the date of birth from the date of survey. The average person's IQ is between 80- 120, and those below 70 are mentally retarded. This investigation method cannot be repeated for a person. Because the psychological state, time, place and other factors of the subjects at that time have certain influence, the situation reflected by IQ may not be comprehensive, so we should make reasonable judgments based on the social adaptability of the subjects.