Objective To investigate the application of RSR in evaluating the promoting effect of transdermal enhancers. Methods Diclofenac sodium was used as drug mode. 1% borneolum,1% azone,1% menthol,1% borneolum+ 1% azone,1% menthol+ 1% azone and 1% borneolum+ 1% azone+ 1% menthol were used as transdermal enhancers. Transdermal absorption experiment of diclofenac sodium was detected on the device of penetrating skins of rat in vitro and lag time,penetrating rates,steady fluxes and enhancement ratio were calculated ...