I am getting a problem with STM32F103RBT6. The problem in pin of microcontroller. I am use the pin for a button . but microcontroller after some month or days the pin short to GND(pin to GND resistance is 68 ohm with power OFF and ON time).

[NandanV]

I don't really understand the problem. I have used STM32F103RBT6 and it is extensively used in production for years. I have never come across such issues.

A schematic of the circuit (just the bare essentials) and why you think it has been shorted to ground might be helpful.

[BSing.4]

i am use PA1 pin for button but is show to shorted to GND . if try to give the 3.3v and i am getting 20milli amp on this pin.

[NandanV]

Sounds silly, but have you tried with another button?

[Uwe Bonnes]

Are external voltages somehow involved? It is easy to kill an STM32 with voltages above the maximum rating.

[Tesla DeLorean]

Certainly sounds like something is electrically wrong with the circuit/implement. Perhaps poor grounding of associated boards/devices, or ESD damage from people touching the system, and the easiest conduction path is via the MCU