Several wave-lengths can be used for an element analysis on atomic absorption spectrophotometry [1]. Et Park et al. [2] wrote that the wave-length of cobalt determination can be changed. So this time the researchers tried to find out the better wave length for cadmium (Cd) analysis. The researchers found that the flat state from the minus to the plus seems to be good for the appropriate Cd analysis (Figure 1). There is another thing for the appropriate wave length; the thing is the pillar near the 228.9 nanometer.