I clicked “Network Settings”, and I found that the ip address was wrong, which is “192.168.1.10/24”, and netmask field is empty, so I modifed the configuration file located in /etc/sysconfig/network, named ifcfg-wlan0, added one line(NETMASK= ‘255.255.255.0’), saved it and reboot the system. After rebooting the system, I still found the ip address is wrong and netmask field is empty, so I have to use ifup command to activate my card manually every time the system starts.