A seven-step sequential extraction procedure was used to investigate the disribution and fractions of Fe, Cu, Zn, Co and Ni in Luochuan loess-paleosol sequence. Seven fractions i.e., exchangeable(EX), carbonates-bound(CARB), Mn-oxidebound (MnOX), amorphous Fe-oxide-bound(AFeOX), crystalline Fe-oxide-bound (CFeOX), organically bound (OM), and residual (RES) fractions were found through fractionation.