區別如下：

1、前者可以修飾比較級（以及最高階），後者不能。Socialism is a much higher social system than capitalism.

2、後者可修飾原級形容詞、或副詞（單音節除外），前者不能。即多音節形容詞、副詞比較級：more expensive, intelligent, generous, frightened, anxiously3、前者可以修飾不作形容詞的分詞，後者不能。This film has been much admired, much discussed, much criticized.4、前者可以修飾後者，反之則不能。She is much more beautiful than she was underage.

1.much的比較級就是more。

如果出現much more beautiful這類的話,much是副詞,more與beautilful共同組成比較級,意為“比……更美麗得多”。因為more可以是much的比較級,除了與多音節形容片語成比較級外,還可以作副詞,如watch TV more 更多地看電視。

2.much用來修飾形容詞的比較級,more與多音節的形容詞和副詞構成比較級。

3.前者可以修飾比較級（以及最高階），後者不能。如：Socialism is a much higher social system than capitalism.

後者可修飾原級形容詞、或副詞（單音節除外），前者不能。即多音節形容詞、副詞比較級：more expensive, intelligent, generous, frightened, anxiously.

前者可以修飾不作形容詞的分詞，後者不能。如：This film has been much admired, much discussed, much criticized.前者可以修飾後者，反之則不能。如：She is much more beautiful than she was underage.