Organic-inorganic minerals were used to modify chemical potassium fertilizer, and imprive its long effect. The potexperiment shows that modified potassium fertilizer increase the biomass of corn in second batch.X ray shows that thestructure change of modified potassium fertilizer is relative to the interlayer property, the suitable proportion the thephysical-chemical condition of modified materials. The IR of chemical potassium chloride fertilizer is weak. And it has amacromolecule pigmentation layer.After organic-inorganic modification, the macromolecule pigmentation layer is beendestroyed. While the destruction of macromolecule pigmentation layer doesn't decrease the availability of potassium. Reversal,the controlled release action of organic-inorganic (minerals) non-envelope is longer than the macromolecule pigmentation layer.