The curing behavior of a self-crosslinkable polyacrylate coating system was studied by torsion braid analysis (TBA), thermogravimetric analysis (TGA), and in situ Fourier transform infrared (FTIR). The results of heating TEA showed that the curing process consisted of two stages : The first stage was the deblocking and crosslinking period-the major period of the curing process. The second stage was the deep-curing period. At the end of this stage, a tighter crosslinking network was obtained. In addition, the detecting results of heating in situ FTIR proved that the reaction occurring in the second stage concerned the reaction of the deblocked isocyanate group and the NH group which came from urethane. In the end, the results of isothermal in situ FTIR showed that the curing temperature affected the extent of crosslinking. The higher the curing temperature, the deeper the curing extent. From the synthetical consideration of the curing temperature and curing time, the optimum curing condition was 170 degrees C/10 min.