PURPOSE: To provide a method for producing methanol by preliminarily reacting a synthetic gas containing hydrogen, carbon monoxide and carbon dioxide in a solid catalyst reactor, separating the produced crude methanol and subsequently reacting the remaining gas in a fluidized catalyst reactor.

CONSTITUTION: A synthetic gas containing hydrogen, carbon monoxide and carbon dioxide gas is preliminarily subjected to a methanol synthesis reaction in a solid catalyst reactor. The obtained reaction gas is cooled to separate the produced crude methanol, and the remaining gas is circulated together with a circulation gas and subjected to a methanol synthesis reaction in a fluidized catalyst reactor. Since the employment of the solid catalyst reactor before the use of the fluidized catalyst reaction system enables an increase in the production of the methanol and a decrease in the amount of the circulation gas, the size of the reactor can be reduced, and the whole installation for the synthesis of the methanol can be enlarged. Since components lowering the synthetic gas in slight amounts, such as sulfur, can almost be removed during their passage in the catalyst layer of the solid catalyst reactor, the life of the catalyst in the fluidized catalyst reactor can be elongated.