In this paper,colorimetric methods were used to study the fifty-one samples collected from the fourth member of the Quantou Formation(K2q4) and the first member of the Qingshankou Formation(K2qn1) of "SKⅠWell" in the Songliao Basin,and get the following conclusions:(1) By using the CIE1976 L* a* b* color system,we found that the colorimetric index L* and a*,b* and a* of the samples assume observably negative correlation(Negative correlation coefficient respectively achieve-0.564 and-0.663),L* and b* were showed observably positive correlation.(2) By analyzing the correlation between the samples' colorimetric index L*a*b *and TOC%,we found that the b*and TOC% were present more significant negative correlation.The correlation between TOC% and L*and a* are not obvious.As part of the carbon cycle,organic carbon has important significance on paleoclimate research of the Songliao Basin,restricted by the total organic carbon content(TOC%),the b*could be a alternative index of the paleoclimate change.