1、就是所有格上的区别，在意义上没有不同，可相互替换。
She signed the paper on behalf of me.
She signed the paper on my behalf.
2、美国人也常常用介词 in 取代介词短语中的 on。
He attended the great ceremony in behalf of his families.
And then there was another time a romanian official came also to speak on behalf of the Soviet Union后来又有一次，一位罗马尼亚官员也来为苏联说情。
Give witness on behalf of an accused person为被告作证
We work for national behalf.我们为国家的利益工作。
Communicate and coordinate with the property management company of the office building on behalf of the Company.代表公司与办公楼的物业管理公司沟通、协调。
state clearly and freely what one thinks(on behalf of sb)（为某人）明确而坦率地说出想法