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In order to examine the inhibition effect of other heavy metal ion on the removal of heavy metal ions by crab shell in aqueous solution, 10 heavy metal ions (Cr^3+, Cd<sup>2</sup>+, Ni<sup>2</sup>+, Zn<sup>2</sup>+, Hg<sup>2</sup>+, Cu<sup>2</sup>+, Mn<sup>2</sup>+, Fe<sup>2</sup>+, Fe^3+, Pb<sup>2</sup>+) were used as single heavy metal ions and mixed heavy metal ions, respectively. In single heavy metal ions, Pb<sup>2</sup>+, Cr^3+, Cu<sup>2</sup>+ were well removed by crab shell, however, Cd<sup>2</sup>+, Ni<sup>2</sup>+, Zn<sup>2</sup>+, Mn<sup>2</sup>+ were not. The heavy metal removal increased as the increase of covalent index (X_m<sup>2</sup>r), and the relationship classified heavy metal ions as 2 heavy metal groups (Fe^3+, Fe<sup>2</sup>+, Cu<sup>2</sup>+, Cr^3+, Mn<sup>2</sup>+, Ni<sup>2</sup>+, Zn<sup>2</sup>+ group and Pb<sup>2</sup>+, Hg<sup>2</sup>+, Cd<sup>2</sup>+ group). In mixed heavy heavy metal ions, the removals of Fe<sup>2</sup>+, Fe^3+, Pb<sup>2</sup>+, Cu<sup>2</sup>+ as 0.49 m㏖/g, regardless of the existence of other heavy metal ions, were similar to the result of single heavy metal ions experiment. The removals of Mn<sup>2</sup>+, Cd<sup>2</sup>+, Ni<sup>2</sup>+ decreased as the existence of other heavy metal ions, however, the removal of Zn<sup>2</sup>+, Cr^3+, Hg<sup>2</sup>+ increased.