Abstract: Anchor items nonequivalent group design plays a rather key part in the equation design. Based on our research, the results showed the following facts: If different anchor items as equating media are adopted, the outcomes are obviously not the same, also if different equating relationship estimation methods are adopted. So we believe that best anchor testing is the objective item group under the present technology and the best equating relationship estimation method is the frequency estimation with fixed number of anchor items.

Key words: test equating, anchor items, equating relationship estimation