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98%。Hickory Hull is a kind of forestry waste and severely pollutes ecological environment, so how to make use of forest resources is the aim of this research. The inorganic composition of Hickory Hull was analyzed by the atomic absorption spectrometry. The results showed that there were more K elements in Hickory Hull. It is nearly common that wet digestive method compared with dried digestive. The thermal treatment was studied on Hickory Hull to produce potassium carbonate, and orthogonalization test was projected on three elements, ashing temperature, time and material diameter. The best technology condition was determined by the experiment index of ash and K rate, the contents of potassium carbonate, through thermal analysis and X ray diffraction analysis. The results showed that the optimal conditions of ashing temperature 600℃, ashing time 6h, material diameter 5～10mm, the rate of K was about 30%; calcination temperature 600℃, calcination time about 0.5 hours, the purity of potassium carbonate can be up to 98%.  