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Theoretical consideration was made on alkali metals concerning the behavior of trace metal components under coal gasification atmosphere. The results are as follows: 1. Fine particles of alkali metal compounds are dispersed in the coal char, and evaporate within the char under high temperature and diffuse through the fine pores and release to outside. On the basis of this assumption, model of evaporation can be made. NaCl is regarded to evaporate mostly in the furnace. 2. The evaporated metal compound condenses on the char surface as the gas is quenched. Amount of condensation on one particle increases as the particle size increases, and the concentration increases with smaller particle size. 3. A model was constructed to estimate the concentration in the char, considering the amount of evaporation and condensation, residual amount, and change in diameter of char particles of the trace metal compound. (22 figs, 1 tab, 14 refs). (ERA citation 13:050367)