Nowadays many People know well that happiness depends not on richness but on health and wellbeing, and many researchers have studied about such subjects. This paper studies correlations, causal relations and factors of many variables to be considered to be able to explain human health and welfare in a country system, using Kendall's tau and factor analysis methods. Also it finds what main variables are to be controlled for a country system to become more advanced in various sides of health and welfare, using Mann-Whitney statistics. The contribution of this paper is that it can suggest essential variables and important relations which are helpful to construct an efficient system of health and welfare in Korea.