异型株是水稻品种试验的重要判定指标，虽在新品种特异性、一致性和稳定性测试、品种纯度鉴定、种子繁育、品种区域试验中已有相关定义，但在实际操作中仍有较大的歧义。本文对异型株在不同品种试验中的概念进行辨析，旨在准确把握异型株的判定，提高水稻品种试验的准确性，避免因误判而导致的品种授权、种子质量、品种审定等问题。另外，本文提出加快DNA指纹检测技术在异型株判定中的应用，以确保品种试验的质量。

Off-type is an important index in rice variety trial. Although off-type has been clearly defined in DUS testing of new varieties, purity detection of varieties, seed reproduction and regional test of varieties, there are still great ambiguities in the actual operation. In this paper, we discriminated the concept of off-types in different rice variety test, aiming to correctly judge off-types, improve the accuracy of rice variety test, and thus avoid the problems of variety authorization, seed quality and variety certification caused by the misjudgment. In addition, it is proposed to accelerate the application of DNA fingerprinting detection technology, in order to ensure the discrimination of off-types in rice more accurate.