robot_upstart: nodes don't work well

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Not really an answer though,

if I rosrun robot_upstart myrobot_node directly,things seems ok.

I don't think an executable called myrobot_node is available in robot_upstart package. On my computer I see:

$ rosrun robot_upstart  (here I press tab)
getifip       install       mklaunch      mkxacro       mutate_files  uninstall     
$ apt-cache policy ros-kinetic-robot-upstart 
ros-kinetic-robot-upstart:
  Installed: 0.2.2-0xenial-20180222-231517-0800

So, I can only assume you're using cutomized version of robot_upstart. If that's the case, no one can't really help you unless we have an access to its code (and even if we do have an access, looking at the cutomized code raises a bar for most of the people on this forum in general, so that the chance of you getting useful response will get slim).

That said, please try to make your question as general as possible. Then, share all the commands you ran and the output regarding installation you did using robot_upstart. Also the entire launch file where you include the node you cited.