Dear everyone:
figsize or subsize can be provided at once." in section of “subplot”I see that you have set projection="Q12c" in both the fig.subplot and fig.grdimage commands. Could you try using projection="Q?" for your grdimage command, while removing the subsize parameter from fig.plot?
Also, are you using the same region and projection for all 4 subplots? If all subplots are using the same projection extent, then it is ok to put them in fig.subplot. But if each subplot has a different projection or region (e.g. like Multiple colormaps — PyGMT), then it is better to remove region and parameter from fig.subplot, and place them in your fig.grdimage call instead (but change any size like projection="Q12c" to projection="Q?")
OK,thank you,I understood, thank you very much!~Good Luck!
On tip for next time posting or if you need more help on this issue, please do not post screenshots but simply copy & past your code and provide all needed data 
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Thank you for your sincerely advice ,I’ll notice next time~