定语从句引导词that和which的区别为：意思不同、用法不同、侧重点不同。
一、意思不同
1、that：用于某些动词、形容词和名词后，引出从句，那，那个。
2、which：哪一个，哪一些，(明确所指的事物)…的那个。
二、用法不同
1、that：that用作关系代词时在下列情况下可以省略，引导限制性定语从句在从句中用作宾语时， 用在there be结构前作主语时，用作表语时，在定语从句与先行词之间有插入语时。
2、which：which用作关系代词，可引导限制性定语从句或非限制性定语从句，引导非限制性定语从句时which可以用整个主句作为其前行词，相当于and that，有时还可引导不定式短语从句。
三、侧重点不同
1、that：that可指人和物。
2、which：which则一般指物。
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第1个回答 推荐于2018-04-23
首先，that可指人和物，which则一般指物。，在限定性定语从句中两者的区别不大，但在非限定性定语从句中有以下区别：
一、以下情况不能用that，只能用which：1、在非限定性定语从句中，逗号之后不能用that；2、介词后面不能用that。
二、以下情况不能用which，只能用that：
1、前面的先行词是不定代词时，如 all ,anything ,nothing, the one 等；
2、如果先行词出现了the only ,the very 时；
3、如果先行词出现了序数词和形容词最高级时；
4、如果先行词中既有人又有物时，如： They are talking about the school and the teachers that they visited yesterday.
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一、以下情况不能用that，只能用which：1、在非限定性定语从句中，逗号之后不能用that；2、介词后面不能用that。
二、以下情况不能用which，只能用that：
1、前面的先行词是不定代词时，如 all ,anything ,nothing, the one 等；
2、如果先行词出现了the only ,the very 时；
3、如果先行词出现了序数词和形容词最高级时；
4、如果先行词中既有人又有物时，如： They are talking about the school and the teachers that they visited yesterday.
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第2个回答 2011-11-26
看到网上有许多这种类别的解释，大多都不是很全面，有些又太深奥了或太长了，所以自己整理了一些精要的内容，希望能帮到你！
which能引导非限制性定语从句，而that不能；非限制性定语从句中即使缺宾语，引导词也不能省略；
先行词是物时，其引导词可用 which也可用that，通常情况下二者可互换，但在有些情况下不能。
1．用which不用that引导定语从句的三种情况：
①非限制性定语从句用which，不用that引导。如：
Football，which is a very interesting game，is played all over the world．
②先行词为that时，为了避免重 复，定语从句用which不用that引导。如：
That which you borrowed from me wasn't a real diamond necklace．
③介词后用which不用that引导。如：
The method with which you solved the problem is very good．
2．用that不用which的七种情况：
①先行词前有形容词最高级或序数词修饰时，用 that不用which引导。如：
This is the best place that I have ever visited．
The second question that is asked is why we don't fall off the earth．
②先行词为little，much，all，none，few，（the）one， something，everything，nothing，anything等不定代词时，用that引导。如：
There is nothing in the world that can frighten him．
③先行词既有指人的名词又有指物的名词时，用 that引导。如：
He told us about the people and the cities that he had visited．
④先行词前有any，all，no，few，every，some，little， much，（the）very，（the）only，（the）last等词修饰时，用 that引导。如：
This is the very coat that I need．
Is oxygen the only gas that helps fire burn？
⑤先行词为which时，为了避免重复，用that引导。如：
Which is the book that you bought yesterday？
⑥先行词在从句中作表语时，常用that引导。如：
Shanghai is no longer the city that it used to be in the 1930's．
⑦当主句是There be．．．句型时，用that引导。
There are two tickets for the film that are for you two．
which能引导非限制性定语从句，而that不能；非限制性定语从句中即使缺宾语，引导词也不能省略；
先行词是物时，其引导词可用 which也可用that，通常情况下二者可互换，但在有些情况下不能。
1．用which不用that引导定语从句的三种情况：
①非限制性定语从句用which，不用that引导。如：
Football，which is a very interesting game，is played all over the world．
②先行词为that时，为了避免重 复，定语从句用which不用that引导。如：
That which you borrowed from me wasn't a real diamond necklace．
③介词后用which不用that引导。如：
The method with which you solved the problem is very good．
2．用that不用which的七种情况：
①先行词前有形容词最高级或序数词修饰时，用 that不用which引导。如：
This is the best place that I have ever visited．
The second question that is asked is why we don't fall off the earth．
②先行词为little，much，all，none，few，（the）one， something，everything，nothing，anything等不定代词时，用that引导。如：
There is nothing in the world that can frighten him．
③先行词既有指人的名词又有指物的名词时，用 that引导。如：
He told us about the people and the cities that he had visited．
④先行词前有any，all，no，few，every，some，little， much，（the）very，（the）only，（the）last等词修饰时，用 that引导。如：
This is the very coat that I need．
Is oxygen the only gas that helps fire burn？
⑤先行词为which时，为了避免重复，用that引导。如：
Which is the book that you bought yesterday？
⑥先行词在从句中作表语时，常用that引导。如：
Shanghai is no longer the city that it used to be in the 1930's．
⑦当主句是There be．．．句型时，用that引导。
There are two tickets for the film that are for you two．
第3个回答 2011-11-23
从句中that做宾语可以省略
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