in which:在．.....里面宽袭；on which:在．.....的上面，或具体时间的某一天。on which和in which都可以用来引导定语从句，修饰先行词，区别在于介词on或in这取决于先行词的搭配。

on which 与in which的区别有哪些

指代不同。“on which”通常表示在某个位置或具体时间的某一天，例如“The meeting will be held on Friday, on which we will discuss the new project”（会议将在星期五举行，届时我们将讨论新项目）；

而“in which”侧重于表示一种所属关系或场合、情况，例如“The situation, in which we found ourselves, was very dangerous”（我们发现自己处于的情境非常危险）。

侧重点不同。“on which”侧重于表示一种目的关系，例如“The house, on which he grew up, was very old and beautiful”（他成长起来的房子非常古老而美丽）；

而“in which”侧重于表示一种所属关系或场合、情况，例如“The party, in which we participated last week, was a great success”（我们参与的派对非常成功）。

用法不同。“on which”和“in which”都可以用来引导定语从句，修饰先行词，区别在于介词的使用，取决于先行词的搭配，例如“The hotel, on which we stayed last year, was very comfortable”（我们去年住的酒店非常舒适）；

而“in which”通常表示在某个场合或情况下，例如“The house, in which he grew up, was very old and beautiful”（他成长起来的房子非常古老而美丽）。