think of与think about的区别如下：
think of 意思是“想起；记起；有……想法（看法）；对……有意见；考虑”。例如：
Will you think of him if he's left?
如果他离开了，你会想起他吗？
Can you still think of his name.
你还能记起他的名字吗？
I'm thinking of going to Beijing for this summer holiday.
我正在考虑今年暑假去北京的事。
think about 意思是“想；回想；考虑；有……想法（看法）”，更着重于想的过程。例如：
We will think about your suggestion.
我们会考虑你的建议。
Don't think about it anymore.
不要再去想这事了。
think of和think about作“想到过去的某事”或“考虑到某事”解即意为“考虑；对……看法”时，可以互换。即：考虑”；“对……看法”
We have many things to think of / about before going there.
在动身去那之前，我们还有许多事情要考虑。
What do you think of / about him?
你认为他怎么样?
think of 可以表“想象一下，想想”，而think about 则不能。例如：
Think of your mother!
想想你的母亲吧！
Think of the danger!
想象一下危险吧！