NOVELTY - Producing product from lignocellulosic vegetable raw material, comprises: pre-treatment of the material to separate cellulose (C6), hemicelluloses (C5) and lignins contained in the material, where the pre-treatment comprises successive steps consisting in destructuring the material, then in separating, on the one hand, and the cellulose (C6) capable of then being hydrolyzed (and fermented for the production of bioethanol) and, on the other hand, the hemicelluloses (C5 oligosaccharides) capable of then being hydrolyzed; enzymatic hydrolysis of the cellulose (C6) and hemicelluloses (C5).    USE - The process is useful for producing product from lignocellulosic vegetable raw material, preferably bioethanol (claimed).    ADVANTAGE - The process increases overall yield and eliminates a part of the equipment and operating costs.    DETAILED DESCRIPTION - Producing product from lignocellulosic vegetable raw material, comprises: pre-treatment of the lignocellulosic vegetable raw material to separate the cellulose (C6), the hemicelluloses (C5) and the lignins contained in the lignocellulosic vegetable raw material, where the pre-treatment comprises successive steps consisting in destructuring the lignocellulosic vegetable raw material, then in separating, on the one hand, and the cellulose (C6) capable of then being hydrolyzed (and fermented for the production of bioethanol) and, on the other hand, the hemicelluloses (C5 oligosaccharides) capable of then being hydrolyzed; enzymatic hydrolysis of the cellulose (C6); and enzymatic hydrolysis of the hemicelluloses (C5). The hydrolysis of the cellulose and of the hemicelluloses is carried out in a sequenced manner comprising (a1) beginning the enzymatic hydrolysis of the cellulose (C6) by means of at least one enzyme (cellulase) for a first period (T1) with a view to obtaining an intermediate hydrolyzate, (a2) adding hemicelluloses (C5) to the intermediate hydrolyzate, and (a3) continuing the enzymatic hydrolysis of the mixture until a final hydrolyzate is obtained at the end of a total period (T2) of enzymatic hydrolysis.