An adsorbent with good adsorption performance for binding low density lipoprotein (LDL) was synthesized through a simple preparation procedure. The phase-inversion technique was employed to form macroporous chitosan beads, which were then simultaneously activated, cross-linked and connected with a long spacerarm via the reaction with ethyleneglycol diglycidylether (EGDE). Tryptophan (Trp) was subsequently coupled to the epoxy-activated beads. This adsorbent demonstrated satisfactory adsorption capacity and selectivity for LDL, and it also exhibited excellent blood compatibility. The effect of spacer arms with different length on the adsorption selectivity was investigated experimentally, and the mechanism was analyzed.