How can I snap the curve perfectly？

[Xie Yuze]

I tried to put the 9 segments together and try to blend each other as one. But even I had opened the Snap, I got this problem.

 

This is my snap setting, could anyone find some ways to solve this problem? Thanks  

[Callum]

Hi Zang, 

I'm not sure if I understand your problem please could you provide more information?

Thanks

C