Objective: To study the effect of an enteric-coating on the determination of indometacin enteric-coated tablet. Method: A ultraviolet sperttrophotometer was used. Result: The enteric-coat soluation had not been absorbed within a range of 310 to 340 nm. There was no remarkable difference(P>0.05). Conclusion: There is no effect of enteric coating on the determination of indometacin enteric-coated tablet.