Hello Peter：
Thanks for your answer!
1. I have updated my Yocto image from https://software.intel.com/en-us/iot/getting-started.
2. upgrade firmware to 1.0.4
3. reboot Galileo
4. root@quark0198e8:~# connmanctl >enable wifi > scan wifi >services >agent on >connect "my SSID" >quit
5. root@quark0198e8:~# ip a
wlp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq qlen 1000
link/ether a0:88:b4:1b:a6:d0 brd ff:ff:ff:ff:ff:ff
inet 192.168.1.103/24 brd 192.168.1.255 scope global wlp1s0
6. WiFi is working!
7. power off Galileo and power on.
8. connect Galileo with SSH(eth0)
9. root@quark0198e8:~# iwconfig
lo no wireless extensions.
wlp1s0 IEEE 802.11abgn ESSID:off/any
Mode:Managed Access Point: Not-Associated Tx-Power=15 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Encryption key:off
Power Management:off
enp0s20f6 no wireless extensions.
10. My WiFi cannot start automatically.
What problem to my Galileo? Thank you again for your time!
Best regards,
Yizhuo