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我仔细看一下 601 需要和immigration visa 一起申请 ？ 不能单独申请？
-Your father has applied the immigrant visa (it was denied), right? Read the following cited from the first link I gave to you in my above response:

If you are outside the United States and a Department of State consular officer has already interviewed you at a U.S. Embassy or Consulate and determined that you are ineligible for an immigrant visa based on a ground of inadmissibility, the consulate will give you a refusal notice. The refusal notice indicates the ground of visa ineligibility and whether you may be eligible to apply for a waiver. If the notice indicates you are eligible to apply for a waiver, you may apply for a waiver by filing Form I-601 with the Lockbox.