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The curing mechanism of furfuryl alcohol and urea-formaldehyde furan resins was investigated using infrared spectroscopy (IR) technique. The curing productions of urea-formaldehyde furan resins modified with different agents (i.e. sorbitol, polyester poiyol, phenol and acetone) and the productions of incomplete curing were characterized by differential thermal analysis (DTA) and thermal gravity analysis (TG). The results indicate that except for polyester polyol, the other modifiers have little effect on the thermal strength of urea-formaldehyde furan resin. Furthermore, the thermal strength can be improved at a temperature of higher than 550℃.