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May 11, 2016 1:46 PM in response to LimingWangby norm123,Hey LimingWang,
I understand that you are having issues with the resolution of your secondary display hooked up to your iMac. Let's go over some troubleshooting options to get you to the best resolution possible for it.
One thing I would look at is the type of connection you have. Are you using DVI, VGA or Thunderbolt? I would look to trying a different adapter or type of connection to see if that changes things. Another thing to try is to reset the SMC and NVRAM to reset that connection as well as the resolution settings for your iMac. Take a look at the at the article below to go over this and some additional troubleshooting steps to get you sorted out.
Get help with video issues on external displays connected to your Mac
https://support.apple.com/en-us/HT201177
Take it easy

