區別如下：
1、中文釋義
traditional 傳統的(歷史悠久,流傳下來的壹種習慣或習俗,有時候也表示"壹般的,常規的"這層意思)；慣例的。
conventional 表示傳統的(含"守舊的"這意思,表示不願意革新的)；常規的，約定的，習慣的，常用的。
2、英文釋義
traditional：Traditional customs, beliefs, or methods are ones that have existed for a long time without changing. 傳統的
conventional：Someone who is conventional has behaviour or opinions that are ordinary and normal. (行為觀念等) 傳統的
3、其他方面
conventional的詞義要比traditional豐富，traditional詞義貼近從文化上來論述，conventional
是此種從習俗上，在交叉的領域二者意思可以互換。
擴展資料：
traditional
1、It's traditional in America to eat turkey on Thanksgiving Day.
感恩節時吃火雞是美國的傳統。
2、Their marriage is very traditional.
他們的婚姻十分守舊。
3、Housework has traditionally been regarded as women's work.
家務勞動歷來被認為是婦女的事。
conventional
1、She's very conventional in her views.
她的觀點很守舊。
2、It's not a hotel, in the conventional sense, but rather a whole village turned into a hotel.
從傳統意義上來說，這並不是壹個旅館，而是變成了旅館的整個村莊。
參考資料：
百度翻譯-conventional
百度百科-traditional