This paper investigated the corrosion behaviors of Ti₃AlC₂ at 700 ℃ in molten KOH with various mass ratios. If the mass ratio of KOH:Ti₃AlC₂≤2, Ti₃AlC₂ can resist KOH hot corrosion in 2 h. Ti₃AlC₂ suffered serious corrosion attack if the mass ratio≥3. The main compositions of corroded samples were amorphous graphite and potassium titanates (K₂O·nTiO₂). If the samples were washed by acid and dried, potassium titanates could decompose to K₂O and amorphous rutile. Based on the experimental results, a corrosion mechanism of Ti₃AlC₂ in molten KOH was proposed.