Can not connect Wi-Fi network at all?
Please execute sudo deepin-feedback-cli when the issue happen and then send us the log.

After a restart i am able to connect to internet through wifi but the network speed is low and sometimes it automatically disconnects. This is one main issue when i installed ubuntu 16.04 also. The result I got when i used the terminal is like this

network/~/.config/
network/~/.config/deepin/
network/~/.config/deepin/network.json
packages.md
pkglog/
pkglog/var/
pkglog/var/log/
pkglog/var/log/apt/
pkglog/var/log/apt/term.log
pkglog/var/log/apt/history.log
services.md
sysinfo.md
syslog
==> Finished, please report a bug to Deepin team with deepin-feedback-cli-Deepin-15.5-all-20180118-151921.tar.gz in current folder as an attachment:
  -> http://feedback.deepin.org/feedback

upload the file name  Deepin-deep-feedback-cli-Deepin-15.5-all-20180118-151921.tar.gz  in here.

sorry sir/madam i didnt get you

The terminal command created an .tar.gz in the folder you had opened in the terminal when you ran it (most likely your home folder).
Upload this archive to the forum.