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On the basis of the theory of molecular design and the difference of physical and chemical properties between tungsten and molybdenum chemical compounds,four precipitation reagents,such as M115-a, M115-betc,were designed and synthesized for eliminating molybdenum from tungstates solution by selective precipitation.Sodium tungstate solutions containing molybdenum made of chemical reagents in laboratory and come from commecial production line were both used as raw materials for technological tests.The results showed that the four synthesized precipitation reagents can eliminate molybdenum effectively to some degree. M115-ais the best one which,eliminates molybdenum with the rate of 94%～99% and more than 99.9% of tungsten recovery can be reached for the liquors with Mo 0.6～1.4 g/L.