格助词“を”除了表示他动词宾语外,也用于表示移动空间与起点.这时多能与“で”“から”互换.其次在用作他动词宾语时,有时也能同“が”互换.由此可知,“を”本身具有替换性,从而凸显自他动词认定的模糊性.本文试图通过例句分析比较,以“を”的替换性为中心,确认其对之前名词的支配力,诠释如何更合理认定动词自他性. In addition to expressing his verb object, the lattice auxiliary word is also used to indicate the moving space and the starting point, at this time, it is interchangeable with “ ” “ kara ” Secondly, when used as his verb object, Sometimes interchangeable with “が” .Therefore, “を ” itself has a substitution, thus highlighting the ambiguity of the self-verb recognition.This paper attempts to analyze by example sentences to “を ” Replacement as the center, to confirm its control over the previous terms, interpretation of how to more reasonably determine the verb self-nature.