Birch veneers impregnated with melamine-formaldehyde resin （MF） were used to make reconstituted lumber. Two hot pressing methods,high-frequency and traditional hot-platen,were used and their influences on the density distribution of reconstituted birch lumber was analyzed. The results showed different heat transfer due to the different hot pressing methods and had considerable impact on the density distribution in the length,width and the thickness directions. Thus,when producing reconstituted lumber with thickness above 30 mm,we recommend using a high frequency hot-pressing method to maintain a uniform density distribution.