A. 赶快 has a nuance of 'as soon as possible'; 马上 is close to 'right away' or 'right now'. B. 赶快 can be only used in sentences in which the subject is people, but 马上 can also be used in sentences in which the subject is a thing. C. Some examples: 我赶快离开了那个地方。 他赶快把打碎的花瓶藏了起来。 你赶快来我家。 我马上就出发。 他马上发现了错误。 你马上就去办这件事。 太阳马上就要落山了。 会议马上就要结束了。

“赶快” 通常是对 第二人称用 例如 （你）赶快上车！ （你）赶快来！ （你）叫他们快点！ 有命令的语气 “马上” 通常是对 第一和第三人称用 例如 （我）马上来。 （他们）马上来。 赶快 在意思上是 命令的 马上 在意思上是 对例如“赶快”这种类似的命令的回应。 例如 A:你（赶快）过来！ B:好的，（马上）来。

赶快，hurry up,马上，ringt now

same:eg.when someone wants me to be quick,but i am so lazy.i ask if i would make it later,he doesn't think so,he will say "马上！"or"赶快！" different:eg.my boss wants to know when will i finish my work,my work will be done in a moment.So i say"我马上就要做完了"but i can't say "我赶快就要做完了" 赶快通常独立使用，用作口语化，会比较合适。 then i'd like to teach you another way to express the same meaning in Northeastern China. it sounds a little funny, it is "麻溜利索的". you can't find it in dictionary,and you can't say it as the pinyin shows.we change the tone,it is ma liu li suo dei(21414)

马上 right now 赶快 as quickly as you can