To establish an in situ single-way intestinal perfusion model, in order to study the intestinal absorption kinetics of AP. The concentration of AP in the perfusate was determined by HLPC. The results showed different AP concentrations in all intestinal segments, with the fastest absorption rate in duodenum, which was followed by jejunum, ileum and colon. In general, the constant absorption rate (Ka) of AP in duodenum and jejunum first increased and then decreased with the rise in drug concentration (P <0. 05); the absorption mechanism may be related to active transport and facilitated diffusion factors. The constant absorption rate (Ka) of AP in ileum and colon generally kept unchanged with the rise diffusion in drug concentration, the absorption mechanism may be related to passive.