ADA4530-1 GRD管脚的guard buffer和地不同？没怎么看明白，或者能否将官方的PCB设计文件发我参考下，第一次遇到这种设计方式，谢谢
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Here's my attempt to translate your question:
"Is the ADA4530-1 GRD pin for the guard buffer different from Ground? Can the official PCB design files made me available to me to refer to? This is the first time I have encountered this design approach. Thank You."
GRD = Guard. This is the output of the integrated guard buffer. This is not the same as Ground.
Here is more info from the ADA4530-1 datasheet:
"The guard buffer (BUF1) is a unity-gain amplifier that creates a low impedance replica of the input common-mode voltage. The buffer input is connected to the noninverting input (IN+). The noninverting input voltage is approximately equal to the input common-mode voltage when the main amplifier feedback loop is settled. "
The ADA4530-1 User guide should contain the necessary information for you to produce a similar design. I don't think the gerber files are available, but I will check.
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