Abstract: Effects of soil factors, topography factors and varieties on yield of Sapium sebiferum were studied. The results showed that variety was the fundamental influence on fruiting state of S. sebiferum, yield per plant of good varieties was far higher than the poor varieties. Soil factors and site conditions also had effects on fruiting effect of S. sebiferum.This study used mathematical statistics analysis method and formula to calculate the comprehensive effect of above factors,drawn up 野harvest assessment scale of Xinyang Chinese tallow tree冶, to provide scientific and technological support for the orientation of S. sebiferum economic forest in Xinyang.