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The pure molybdenum sheet and the Al2O3-doped molybdenum alloy sheets were prepared by the hydrothermal method and a subsequent powder metallurgy process.The effects of Al2O3 particles addition on the recrystallization temperature,microstructures and proper-ties of the Mo sheets were investigated as the focus.The Al2O3-doped Mo sheets have greater strength than the pure Mo sheet,and the 0.50 wt％ Al2O3-doped Mo sheet has the best performance.For the unannealed specimens,the strength increases with the increase in Al2O3 content.Compared with that of pure Mo sheet,the strength of 0.50 wt％ Al2O3-doped Mo sheet increases by 72 ％,54 ％,73 ％ and 76 ％,respectively,when annealed at 1000,1100,1200 and 1300 ℃,which is a very obvious rein-forcement effect.When lower than 1100 ℃,the elongation of the pure Mo sheet is the best.However,when the annealing temperature is equal to or greater than 1100 ℃,the 0.50 wt％ Al2O3-doped Mo sheet obtains the best elongation.Moreover,the Al2O3 addition can greatly improve the recrystallization temperature of molybdenum sheets;for example,the recrystallization temperature of the 0.50 wt％ Al2O3-doped Mo sheet increases by 200 ℃ at least than that of the pure Mo sheet.Lastly,the strength-ening mechanism was discussed.