1 Concept, Meaning and Developing Trend of Mental HygieneMental health prefers to the all kinds of methods and measures to maintain human mental health and personality sanity, to prevent mental diseases from occurring and to promote good social adjustment ability. Along with the progress of medical science, people found that more and more somatic diseases are related with mental factors. So, the meaning of mental hygiene is to promote the mental health of whole social population. Formerly in 1961, world mental health association pointed it out in inteational mental health prospect that the task of mental hygiene is to make mental health level of residents reach as high as possible in the widest aspects such as biology, medicine,education and sociology[1].