Obsessive–compulsive is a extreme obsession disease. Everything must be in a order. Everywhere have to be clear or distant. For example, walking on the ways is very hard for this people. Because they have a step style. For instance, the ways have some black and white stones. They choose one color and walk on just one color stones. Sometimes, I think and do like them, and I feel to everyone has some obsessions. But we mustn’t forget people who has this disease can be very clever and genius. Obsessive-compulsive like other most illness don’t complication to life, if we could learn to live with it.