弱弱的问一个，怎么用labview去噪啊，应该用哪个函数啊

It depends on the properties of your signal and how you want to do it. Please explain your problem in detail. Denoising is a too general topic.

哦，呵呵，不好意思，是方波，幅值为1，白噪音为0.6，占空比为50%，我希望把噪音去掉，有噪音时没有办法测出占空比，谢谢了:-)
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Please search example using key word "pulse" and look at the code of "Pulse and Transient Measurements".
You can simply use Pulse Measurement VI to calculate the duty cycle (Zhan Kong Bi).I just tested in LabVIEW with using square wave and white noise with amplitude of 0.6. The built-in function will return perfect result.