Occurrences of nelsonites associated with ultramafic rocks are very rare. Recently, small small concentrations of nelsonites were discovered in close association with Fe-Ti-P hornblendite from the Tiemahabaqin clinopyroxenite-hornblendite complex, Northern Hebei Province, China. In order to gain information about the genesis of the nelsonite, this study present major and trace element data of the apatites from rocks that formed at different stages of magmatic evolution including clinopyroxene hornblendite, hornblendite and nelsonite. Spider diagrams of apatites form different rock types are very similar in shape. However, trace element compositions such as F, U, Th, Sr and ∑REE of apatites from the nelsonite are significantly higher than those from the clinopyroxene hornblendite and hornblendite and exhibit a continuous trend. It is indicated that the nelsonites were separated at the latest stage of magmatic evolution when Fe-Ti-P components were saturated in the parent magma of the hornblendites. Moreover, genetic minerageny studies of apatites have shown that crustal materials account for significant part for the parent magma of the Tiemahabaqin complex.