Whether do any organizations need facility management department? What function of benefits will bring when the organization sets up one facility management department? If the organization lacked one facility management department, what the disadvantage it will bring to influence the organization's operation? Does it has relationship between raising efficiency or improving performance and facility management department? I shall indicate some evidences and causations to explain what will be occured when the organizatin owns one facility management department or it lacks one facility management department in its organization. Any readers can make judgement whether in what suitations , the organization needs to set up one facility management department in order to bring advantages or waste essential human resource or raise service cost from the facility management department. In my this book, I shall attempt to explain whether facility management can bring what real benefits to our societies, business organizations and economic environment. Readers may have more clear understanding what facility management functions mean.