Abstract:Polycarboxylic acids and inorganic salts are used as esterification agents and catalyst, respectively, in our research on wood crosslinking reaction. This new crosslinking system is composed of the reagents of non-formaldehyde series and it is soluble, poison-free and pollution-free. The characteristics and parameters (esterification degree, carbonyl ratio and crosslinkage degree) of esterification between wood and polycarboxyic were determined by FTIR 13C NMR spectra in this paper.