the fracture behavior of polymer coating fabricated by Low Temperature High Velocity Air Fuel (LTHVAF) spray system was researched. Experiment results show that the coatings are dense with average porosity. The adhesion strength of the coatings is high, the average adhesion strength excesses 13.47MPa. During the tensile stress process, the fracture is occurred in coating interior. The result illustrate that the coating material fracture intensity is less than the binding strength. Plenty of craze and honeycombed hole exit in the fracture surface. The coating fracture mechanisms are that the crackle occurs at the coating objection for the stress focus.  However, some dispersive particles hold up the crack expansion, which is obliged to change. So, the coating binding strength can be increased.