  We have studied the electronic structure of RuP and related Ru pnictides
using photoemission spectroscopy. Ru 3d core-level and valence-band spectra of
RuP show that the Ru valence is +3 with t_{2g}^5 configuration. The
photoemisson spectral weight near the Fermi level is moderately suppressed in
the pseudogap phase of RuP, consistent with the pseudogap opening of
2\Delta/k_BT_c ~ 3 (gap size \Delta ~ 50 meV and transition temperature T_c ~
330 K). The Ru 3d peak remains sharp in the pseudogap phase and the insulating
phase of RuP, suggesting that the electronic orderings responsible for the
phase transitions are different from the conventional charge density wave.
