回复：明白，那我需要准备什么样的材料呢？有什么网站我可以看得吗？

Here is the list of your I-130 filing for father and mother. You need to file two Form I-130s including the following documents for your parents, separately. After your filing, just wait for the National Visa Center’s instructions/packet and then, follow the instructions to do the next procedure.
1. Payment as required by USCIS.

2. Cover Letter. Should include a description of what your petitioning are for (I-130), a table of contents (list everything in the packet). Make sure to sign and date the cover sheet.

3.Form I-130: Petition for your parents, respectively.

4.Copy of the full Birth certificate (front and back) for the US Citizen.

5.A copy of your proof of naturalization OR a copy of ALL pages of your US Citizen's passport (If applicable).

6.G-325 filled out by you, signed and dated.

7.One passport-type your photo. Write your full name on the back. Place in a plastic bag and label the bag "Photo of ". Attach the bag to a sheet of paper and place behind the corresponding G-325.

8.G-325 filled out by your parents, respectively.

9.One passport-type photo of your parents, respectively. Write the full name of your parents on the back, respectively. Place in a plastic bag and label the bag "Photo of (insert name) ". Attach the bag to a sheet of paper and place behind the corresponding G-325.