The sunlight has an important role in metabolism of calcium ( Ca) and phosphorus ( P). The sunlight has different effects in different places. Therefore the pattern of metabolic disease depends upon geographical place. In this investigation two groups of workers( one group working in shadow and the other under the sunshine) were chosen as control and experimental groups respectively.these two groups were almost equal in all the factors which are effective on Ca and P in serum concentration, expect the intensity and duration of sunshine. The Ca, P , alkaline phosphates ( ALP) and protein total concentration were measured by RA1000. Auto analyzer and parathyroid hormone ( PTH) was measured by radioimmunoassay ( RIA). We concluded that the sunshine exposure leads to an increase in Ca and P concentration and rate of calcification, but this increase was in the normal range. Furthermore the mean serum concentration of ALP and PTH did Not change significantly, and total protein concentration was lower in experimental group compared with the control.