1.用法不同：
those
特指,替代前面出现的同类名词，但不是同一个物体。相当于the+可数名词复数。
此时those后通常要用介词短语或分词做后置定语.可与the ones互换。
例句：Witnesses said that two people were killed, but those accounts could not be confirmed.
目击者说两人遇害，但那些说法都没法得到证实。
ones
泛指，替代前面出现的复数名词。
the one特指,替代前面出现的单数可数名词,相当于the +单数可数名词，相当于that ,后面常有定语修饰。
the ones特指,替代前面出现的复数名词,相当于the +复数可数名词，相当于those ,后面常有定语修饰。
例句：Softer fabrics are much more becoming than stiffer ones.
软面料要比硬面料合身得多。
2.意思不同：
those
det. 那些（that 的复数）
pron. 那些（that 的复数）
ones
n.二进制反码，一个人，任何人，人们( one的名词复数 )，（表示与别的对照）某一例[类]，玩笑，笑话
扩展资料：
it，that，one，ones，these，those这几个代词的用法：
1.one指代上文提到的单数人的人或物，指“同一类中的一个”，表示泛指意义：即：a/an十单数可数名词.
例句：The population problem may be the greatest one of the world today.（one=a problem）
2.the one 指代上文的单数可数名词，可以用形容词放在one之前修饰，one后也可以接后置定语修饰，专指“同类的那/这一个.”表示特指的含义.即the+单数可数名词.
例句：The film is not as good as the one I saw yesterday.（the one=the film）
3.ones指上文提到的复数的人或物，表示“同类中的许多”，表示泛指意义.
例句：These apple are bigger than those ones.（ones=apples）
These shoes are too small.Please get met some larger ones.(ones=shoes)
4.the ones指上文的复数可数名词，ones之前可以有形容词修饰.也可以用后置定语修饰，专指“同类中的那/这一些”.表示特指，即the+可数名词复数.
例句：He advised farmers to choose the best seed-heads，the onesthat had the best colour.(the ones=the seed-heads)
5.that指上文出现的名词，表示同类的东西，一般不指人，既可指代可数名词单数，又可指代不可数名词，常要求有后置定语修饰，表特指，相当于the one Kunming better
例句：The weather of this week is worse than that of last week.(that=the weather)
Few pleasures can equal that of a cool drink on a hot day.(that=the pleasure)
The population of China is larger than that of Japan.(that=the population)
6.those 用来代替复数可数名词，常要求有后置定语，表示特指.即the+复数可数名词.相当于the ones.
例句：The students in Class one are more than those in Class Two.(those=the students)
The mistakes made by Chinese students are quite different from those made by the Japanese students in English study.(those=the mistde)
7.it 指上文提到的同一事物，与前面名词是同一个，表特指.即the/所有格/that/this+单数可数名词.
例句：I have a pen.It is blue.(it=my pen)
Is this book yours，I want to use it.(it=your book)
Her interests are different from those of her childhood.(those=the interests)