The EXTENTS operation in DRC could help. Especially with the CENTERS option. Here is a link to a TechNote with a few more details.
If you preferred to have the exact coordinates of the outside edges of the bondpad then the FLATTEN operation might be even easier to use than EXTENTS CENTERS. You could have just one rulecheck in the SVRF rulefile, then run Calibre DRC, then the coordinates would be shown in the ASCII results database after the run.
but what is the layer in "EXTENTS layer CENTERS"? The reference is too simple. I am not very clear yet. Can you give me a simple example ,thank you.
This would be a good thing to have an example of. I may be able to put something like that together.
Ideally, how would you like to see the coordinates?
A list of coordinates describing the edges of the bondpad?
A single coordinate very close to the center of the bondpad?
If you want the center coordinates (to make a bonding simulation) you can run an LVS with -bpf switch "on" (calibre -lvs -bpf rule_file). Search the Calibre Verification User's Manual. It's not necessary to have a clean LVS, but you must have the ports (top circuit) in order.
"This switch also creates a file containing top-level port information. The name of this
file is report_name.ports where report_name is the name specified in the LVS Report