首先我们来看下on business和in business的大致意思：
on business：词性为短语，这个短语中的介词on表示状态或情况，business指的是工作、事务或商业活动。
in business：词性为短语，这个短语中的介词in表示状态或位置，business指的是商业活动、经营业务。
通过下面的表格我们了解下on business和in business的含义、发音和用法
接下来让我们看下on business和in business的用法区别：
1.语义角度：on business强调出差或在外的状态，而in business强调从事商业活动或经营业务的状态
例子：
- He is on business in New York.
(他正在纽约开会。)
- He is in business and very successful.
(他是一位成功的企业家。)
2.搭配动词角度：on business通常搭配动词go、be、travel等，表示出差或在外；in business通常搭配动词engage、start、operate等，表示从事商业活动或经营业务
例子：
- He often goes on business trips for work.
(他经常因工作需要出差。)
- His father is in business in the catering industry.
(他父亲在餐饮行业经营生意。)
3.时间表达角度：on business通常与时间段连用，表示在这段时间内出差或在外；in business通常表示长期从事商业活动或经营业务
例子：
- He will be away on business next week.
(他下周要去外地开会。)
- She has been in business with her family company for ten years.
(她在家族企业中工作了十年。)
4.程度角度：on business表示参与商务活动的程度较轻，通常是临时性的；in business表示参与商务活动的程度较深，通常是长期性的
例子：
- He is just on business to attend a meeting, not really engaged in business activities.
(他只是去开个会而已，不算是真正的商务活动。)
- He is fully engaged in his own business.
(他全心全意投入到自己的生意中。)