First share the machine and the host to be in the same LAN, and can communicate with each other, and to shut down the host firewall, this is very important or can not access the host, in the Control Panel settings. You can open the network to see if in a LAN, open a command box with Ctrl+r to enter CMD, and then ipconfig to see each other's IP, with the command ping + the other side of the IP to see if it can communicate.
Make sure that 2 of these are satisfied and can be shared. On the host right-click on the file you want to share, there will be a few options, click on "Specific user", will automatically pop up a small window, you can try to add the computer you want to share the user, but this may be because the host is not recognized and failed, I select the click to add the left down arrow, and then select Everyone, You can choose its permissions, read-only and upload 2 kinds, generally choose read-only on the line. Then click on the shared host here to configure.
To share the file of this computer, only need to open a command box with Ctrl+r, enter the IP of the \\+ host can open the files shared by the host. If the error is checked, is not the choice of everyone and IP whether the input is accurate.
or open My computer directly, enter the \\+ host IP in the address bar is also possible, that is, the speed may be slower. or open Cortana input \\+ip.
It is recommended that after sharing is complete, the firewall and shared files are closed in a timely manner, so that the computer is more secure.
This is the method I have tested, hope can help to the needs of friends, there is not clear where please forgive. Everyone commented.
How I implement file sharing in Windows10