Objective To test the effects of different surface treatments on the adhesive strength between POPO fiber post and resin cement. Methods 50 fiber posts were divided into 5 groups at random according to different surface treatments. Group A: Control group, no treatment. Group B: Silanization for 60 s. Group C: Etching for 30 s. Group D: Etching for 60 s. Group E: Etching for 120 s. Crowns of 45 fresh premolars were removed and assigned randomly to 5 test groups. After bonding and embedding the retentive force of the samples were tested by an universal testing machine. The morphology of the post surface was observed by a scanning electron microscope（SEM）. Results There were significant differences among the effects of different surface treatments on the adhesive strength between POPO fiber post and resin cement（P
