Results of research of influence of ultrasonic treatment on the process of extraction of reducing sugars and time of setting of wood-cement composite material. It proves the ultrasound effect on hydrolysis, destruction and wash-out of sugar from coniferous wood. The article describes the research results of effect of ultrasound cavitation on hydrolysis and destruction of polysaccharide. The dependence of the amount of extractable reducing sugar on temperature, cavitation number, hydrogen indicator is determined. Technological conditions of ultrasound treatment of wood chips are determined. The article proves the effect of preliminary treatment of wood chips on the processes of wash-out of reducing sugar. The practical importance of the research is proved.