arrive in : 后面接大的地点，比如国家、城市

如：He arrived in Shenzhen yesterday .

arrive at: 后面接小的地方，比如车站、公园

如：He has already arrived at the park.

注意：arrive 后面如果是home/here/there等表示地点的副词，则不需要介词。

如：It was almost 6 o’clock when we arrived there.