Translated by moderator. See below the line for original post.
How to create a floor slab by picking up CAD polylines and elevation points using Dynamo
Original post below.
如何通过Dynamo，拾取CAD多段线及高程点创建楼板
Welcome to the forum @samYF
The language here is English, which sadly is a requirement to make search work (annars skulle jag bara svara på svenska för att få in min praktik). Please translate future posts as I did above using the tool of your choice, including your original post between a separation marker if you would like (may come in handy if we ever get multiple language support).
Thanks!
How to create a floor slab by picking up CAD polylines and elevation points using Dynamo 
have you tried looking for older posts in the forum? usually they can help you get going.
i found this older posts with some screenshots that could help you set it up. Can't create floor from CAD - #3 by arincakkin
Thank you brother, but I still can’t solve the problem through the link you shared. This is the Dynamo script I wrote. I can create a floor using CAD contour lines, but I can’t pick digital text as the elevation point for the floor. Because the surface layer I need to create consists of four or more different elevation points. Here are my Dynamo scripts and CAD sample files. If possible, could you please show me the optimized Dynamo file. Wishing you a wonderful day, best wishes.
CAD duoduanxain.dyn (27.6 KB)
shili.dwg (54.0 KB)
Please help me
Bit tied up this afternoon, and have dinner reservations so I have to sign off for the weekend. Best bet for now is to use a DataExtraction command in AutoCAD to pull the location of each text and it’s value into a CSV, and then use that to adjust the elevations in Revit.
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Wow, I wish you a wonderful dinner. We’ll contact you next week. Good luck, brother 
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Hello, Jacob. Can you continue to help me finish this difficult part? I’m looking forward to your assistance and I would be extremely grateful. 
Does your polyline have an elevation in the properties (in the CAD File)? or only the text?
If not i would follow Jacobs advise. He’s far more experienced regarding this matter. If you’re still having troubles i suggest doing a little trial and error or research on here. That has been my learning curve so far too… its difficult but rewarding.