on foot 和by foot具體的區別和用法：
在我國新近出版的，由蘇州大學王文昌主編的《英語搭配大詞典》是壹部當前國內最完備的詞語用法辭書。其中，在foot詞條下也收入該用法如下：
by [on] foot：步行
by foot
步行;
例句：
①You'll travel by foot now, alone!
現在妳得步行了，壹個人！
②Sorry, the elevator doesn't work, you have to go upstairs by foot.
對不起，電梯壞了，妳只好走上樓去了。
③The team often had to travel by foot and boats to reach these communities.
工作小組常常需要步行和乘船才能到達這些社區。
on foot 方式狀語，壹般放在句末。
例句
①I go to school usually on foot.
我上學通常是走路去。
②I used to go to work on foot.
我往常都是步行去上班。
③He vainly hope to travel round the world on foot.
他夢想步行周遊世界。
④I left my car in a lay-by and set off on foot.
我把車留在路側停車帶，徒步而行。