Hi hemin88,
To configure unidirectional port isolation, run the am isolate { interface-type interface-number }&<1-8> or am isolate interface-type interface-number1 [ to interface-number2 ] command in the interface view.
For example, configure unidirectional isolation on GigabitEthernet1/0/1 and GigabitEthernet1/0/2:
[Quidway] interface gigabitethernet 1/0/1
[Quidway-GigabitEthernet1/0/1] am isolate gigabitethernet 1/0/2
I hope it helps!