怎么分析下面这句话中的“of”的用法？

回答如下：
本句是主系表结构，其中的介词短语of little help在句中作表语。be of +抽象名词(如value, importance, benefit, help, necessity, use等)= be +形容词。例如：
This work is of great importance = This work is very important.
This grammar book is of great value to us English learners = This grammar book is very valuable to us English learners.
The English-Chinese dictionary is of great help to your English study = The English-Chinese dictionary is very helpful to your English study.
另外，"be of + 名词 "还可以表示句子主语在度量、大小、颜色、类别、年龄等方面的特征。例如：
She is of the same age as I.
These cars are of different colours.
These two pairs of shoes are of different sizes.
The two houses are of different heights / shapes.
They are of the same quality / weight / type / kind.

"be of+形容词"的搭配，表示前面所说的东西"带有××的属性"，在这就是"对××是有点帮助作用的"。希望能帮到你。

of 是一个定位的介词，表示在什么的方位。

在……之中，表示范围