@ballenZXFHH
To show dimensions this way in your drawing, you do not want to modify the parameter format. You CAN change that, yes, but it won't affect how your dimensions are displayed. To do this, use an architectural units dimension style (Styles editor on the Manage tab), and make sure it is set to display "Trailing Zeros." If you want this for all dimensions, remember to set it in the Object Defaults section of your Styles Manager. If it is only for one or two dimensions, you can change those individually at the drawing level from the pull down at the end of the Annotate ribbon.

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Chris Benner
Community Manager - NAMER / D&M