Install xinput  and execute xinput to find out the device id you want to modify.
Then through 'xinput list-props ' to get the support property of the device.
The next is to execute "xinput set-prop " to set the property value.

Let us give an example, if the touchpad id is 12,the command will be ：xinput set-prop 12 'Synaptics Tap Action' 0 0 0 0 1 3 2

Ps:
you need to disable gesture feature by: gsettings set com.deepin.dde.daemon gesture false

Here is the detailed touchpad property file：ftp://www.x.org/pub/X11R7.5/doc/man/man4/synaptics.4.html