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我本人是绿卡持有人，本次是准备为持B1/B2入境美国的太太及未成年孩子申请485，我目前在美国的账户上有一些股票，也有一些存款，我太太在中国也有存款与房产

-Unless your spouse bring her assets as cash to US, her assets in China cannot be used for I-864.

，那我是不是提供我本人的股票持有证明或我的存款证明即可？（不需要另外再找第3方担保？），是不是有股票或存款证明就可以了？

-Yes. Not need to sell out your stocks. You also can use your retirement plan such as  401k for I-864 (not need to withdraw any money from 401K, and just provide the proof). If you  have a house in US, you also can use the market value minus the loan (if any loan) for I-864. Not need to sell your house.

我记得好象是有一个贫困线，低于该贫线则需要和担保，那么这个贫困线是指的在美国资产还是年收入？

-Your income and assets must meet 125% of the US poverty line. See this link:

2024 HHS Poverty Guidelines for Affidavit of Support | USCIS

If you use assets for I-864,, you need to have the assets (cash value) 5 times of the 125% of US poverty line. 

For example, you need to have income from your employment $32,275 to meet the requirement of I-864 filing (total three family members in your household). But your current salary income is $30,000, then your asset cash value must at least 5 X $2,275 = $11,375.

（如果是资产，我可以让我太太把相应存款转换成美元并汇到我美国银行的户头，但如果是指年收入，那我肯定需要找第3方担保人了，我想尽量避免麻烦别人）