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I see, that the demonstration projects shipped with DE2 have both GPIO_0 and GPIO_1 pins included in the top level entity and pin assignments, so the pins should be displayed in pin planner. But the pin assignments are also listed in the user manual, so you can restore the assignments, if you possibly have deleted it.
P.S.: I opened the DE2_Default project, and it shows all GPIO pins in pin planner.
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thanks for ur replying, I found the pin assignment I used is different from the board, I check the right one,then I find them.
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