Learn Chinese Grammar: 接下来(jiēxiàlái= next) vs. 然后(ránhòu=after that, then):

接下来 is used when you are talking about the sequence or series of things. 然后 is often used with先(xiān=first) to indicate the sequence of two events.

Example:

1. Thanks Ms. Li for your speech. Next, we will listen to Mr. Wang sings a song.

谢谢(xièxie=thanks)李(lǐ=Li)女士(nǚshì=Ms.)的(de)演讲(yǎnjiǎng=to make a speech)。接下来(jiēxiàlái=next)，我们(wǒmen=we)要(yào=will)听(tīng=to listen)王(Wáng=Wang)先生(Xiānsheng=Mr.)唱歌(chànggē=to sing a song).

2. First, we will listen to Ms. Li's speech and then afterward we'll listen to Mr. Zhu sings a song.

我们(wǒmen=we) (先(xiān=first))听(tīng=to listen) 李(lǐ=Li)女士(nǚshì=Ms.)的(de)演讲(yǎnjiǎng=to make a speech)然后(ránhòu= then)听(tīng=to listen)王(Wáng=Wang)先生(Xiānsheng=Mr.)唱歌(chànggē=to sing a song).