What about，是用来询问与前一个事物相关的另一个事物的状态;而How about，多数是用来征求别人的意见，问别人是否能够接受另一个选择。
how about[hau əˈbaut] …怎么样，…怎么办
what about[hwɔt əˈbaut] adv. 怎么样，以为如何（提出建议或用以引出话题）
一、how about的使用例如：
Well, I enjoyed that. How about you two?
嗯，我觉得那很棒。你们俩呢？
You want Jeannie to make the appointment for you? How about the end of next week?
你想让珍妮帮你预约吗？下周末怎么样？
The twins made their appearance at three o'clock. How about that? Spot on time.
双胞胎在3点时出现了。神吧？绝对准时。
How about going shopping and seeing a show in London?
去伦敦购物再看场演出怎么样？
Are your products and services competitive? How about marketing?
你们的产品和服务有竞争力吗？营销又怎么样呢？
二、What about的使用例如：
What about going out with me tomorrow?
明天和我一起出去怎么样？
What about my copier? Can you get it going again?
我的复印机怎么样了？你能把它修好吗？
You are all going. What about me?
你们都去，我呢？
What about the odd chance that you do put an innocent man in the dock?
若是你真的把一个无辜的人送上被告席了呢？
What about you? Would you like to come and live in Paris and work for me?
你呢？愿意到巴黎生活并且为我工作吗？
1）两者通用
在表达提出某种建议的意思「... 怎么样；... 好吗?」时，"How about" 和 "What about" 是可以互换的，即意思是一样的：
"How/What about a drink?"
(喝杯酒怎么样?；喝杯酒好吗?)
"Where should we go on vacation?"
"How about Hawaii?"
"What about Japan?"
(「我们该去那里度假呢?」，「去夏威夷怎么样?」，「去日本好吗?」)。
2）What about
若是征求意见或打听消息，你只能使用 "What about"
"What about the university?" (强调 about 这个字)
- 这是 "How about ...." 无法表达的意思。
3）How about
可以用来表达对事物的惊讶："How about those dogs?"
- "What about " 则没有这项意思。
如果你提供多项事物让人选择，那么必须使用 "How about" ：
"Here are three jackets you might buy. How about the grey one?"。
附加一个国外老师的备注：
“When I hear "What about," it's almost always followed by a noun or gerund, whereas with "How about" you can use a verb or noun.”
也就是说 what about 后面接名词或者动名词(+ing) how about 后面接动词或者名词
那么最直接的区别就出来了，即：
what about 后面用跟名词的多，how about 后面跟动词现在分词多。 如：What about this one? How about going for a walk?本回答被提问者采纳
1）两者通用
在表达提出某种建议的意思「... 怎么样；... 好吗?」时，"How about" 和 "What about" 是可以互换的，即意思是一样的：
"How/What about a drink?"
(喝杯酒怎么样?；喝杯酒好吗?)
"Where should we go on vacation?"
"How about Hawaii?"
"What about Japan?"
(「我们该去那里度假呢?」，「去夏威夷怎么样?」，「去日本好吗?」)。
2）What about
若是征求意见或打听消息，你只能使用 "What about"
"What about the university?" (强调 about 这个字)
- 这是 "How about ...." 无法表达的意思。
3）How about
可以用来表达对事物的惊讶："How about those dogs?"
- "What about " 则没有这项意思。
如果你提供多项事物让人选择，那么必须使用 "How about" ：
"Here are three jackets you might buy. How about the grey one?"。
附加一个国外老师的备注：
“When I hear "What about," it's almost always followed by a noun or gerund, whereas with "How about" you can use a verb or noun.”
也就是说 what about 后面接名词或者动名词(+ing) how about 后面接动词或者名词
那么最直接的区别就出来了，即：
what about 后面用跟名词的多，how about 后面跟动词现在分词多。 如：What about this one? How about going for a walk?本回答被网友采纳
1）两者通用
在表达提出某种建议的意思「... 怎么样；... 好吗?」时，"How about" 和 "What about" 是可以互换的，即意思是一样的：
"How/What about a drink?"
(喝杯酒怎么样?；喝杯酒好吗?)
"Where should we go on vacation?"
"How about Hawaii?"
"What about Japan?"
(「我们该去那里度假呢?」，「去夏威夷怎么样?」，「去日本好吗?」)。
2）What about
若是征求意见或打听消息，你只能使用 "What about"
"What about the university?" (强调 about 这个字)
- 这是 "How about ...." 无法表达的意思。
3）How about
可以用来表达对事物的惊讶："How about those dogs?"
- "What about " 则没有这项意思。
如果你提供多项事物让人选择，那么必须使用 "How about" ：
"Here are three jackets you might buy. How about the grey one?"。
附加一个国外老师的备注：
“When I hear "What about," it's almost always followed by a noun or gerund, whereas with "How about" you can use a verb or noun.”
也就是说 what about 后面接名词或者动名词(+ing) how about 后面接动词或者名词
那么最直接的区别就出来了，即：
what about 后面用跟名词的多，how about 后面跟动词现在分词多。 如：What about this one? How about going for a walk?