According to the press release of 1990, most 40% of back pain patients were housewife. But nowadays, the rate of patients has been increasing in number of students and office workers. This result is deduced from whole family doing housekeeping work by increasing of husband and wife both working, Not only wife's things. Also, children do some part of housekeeping work like washing dish and somethings instead of their mother. modern sinks are set same pattern of the height, So children have to set extra chairs or boxes so as to do washing dish and washing fruits on the sink. but this situation makes chilren dangerous and cause possibility of falling down. Also children need to clean up their working place. Of course, the original sink foot has the ability to adjust the height while supporting the bottom. For this reason, if you rotate the device, the height of the sink will increase and if you rotate in the opposite direction, the height is low. Adults can learn how to use easily. But the children still difficult to use due to lack understanding. Therefore, a new sink for height adjustment is required to solve above problems. The purpose of this paper is You should be able to automatically adjust the height of the sink depending on the individual's height. If the height of the sink is too high or too low, people will feel the pain in the waist while using the sink. That's why this control system can prevent back pain and this paper is a study of the automatic height control system.