Manchurian Ash （Fraxinus mandshurica）, Manchurian Walnut （Juglans mandshurica） and Spruce （Picea jezoensis var. komarovii） lumber were selected to determine process variables to glued laminated timber （GLT） with water based polymeric—isocyanate adhesive. The influence factors, such as the pressure, pressing time and adhesive consumption, on shear strength of the glued laminated timber were investigated through the orthogonal test. The results indicated that optimum technological parameters for glued laminated timber manufacturing were as follows: pressure at 1.5 MPa for Spruce and 2.0 MPa for both Manchurian Ash and Manchurian Walnut lumber, pressing time for 60 minutes and the spread of 250 g/m,2,.