We try to find some colors that have the potential to study stellar age and metallicity from UBV RIJHK and ugriz colors using the simple population synthesis model of Bruzual & Charlot 2003 (BC03). The principal component analysis (PCA) (See Kong & Cheng 2001) and relative sensitive parameter techniques (see Worthey 1994) are used in this work. As a result, some colors such as (B – K), (R – K), (I – H), (B – V), (U – R), (R – I), are found to have the ability to break the stellar age-metallicity degeneracy partially and can possibly be used for studying stellar populations of galaxies.