Two and three Stokes-anti-Stokes mode pairs appearing simultaneouly in-stimulated four-photon mixing (SFPM) have been taken phbtoes for the first time. By using the semiclassieal approach the coupled wave equation for SFPM in optical fiber are derived with regard to the Eaman resonance and the fiber guiding property, and the coupling coefficients given by Stolen et al. are corrected. The gains of Eaman resonant SFPM and the relation between SFPM and SES are investigated. The ratios of anti-Stokes to Stokes light intensities in the phase-matching and phase-mismatching conditions and the expression for the Raman upper-level molecular number in SFPM are found.