The distribution and migration characteristics of alkali metals in Shenhua Zhundong high-alkali coal at different gasification temperatures were studied with a 0.25 t/d high alkali coal thermochemical conversion apparatus. The experimental results show that sodium in the coal exists mainly in a water soluble form, and potassium mainly in an insoluble form. At different gasification temperatures, sodium content of bottom ash is generally higher than that of the circulating ash, the higher the gasification temperature is, the greater the impact of gasification temperature on the fly ash alkali metal distribution characteristics is, the migration characteristics of sodium is significantly different from that of potassium. At the gasification temperatures from 850 to 1000℃, 86.7%~93.1% of sodium in the coal is condensated in fly ash, sodium in fly ash exists mainly in NaCl crystal phase form.