The high duplicate checking rate of SCI papers is a serious problem, because it may affect whether your papers are accepted or not. Here are some possible solutions:

1. Rereading and revision: First of all, you need to reread your paper and find out the possible overlapping parts. This may include references you cited, or your arguments and opinions. Once you find these parts, you can revise them to ensure that your paper is original.

2. Use duplicate checking tools: There are many online duplicate checking tools that can help you check the duplicate checking rate of papers. These tools usually provide a detailed report telling you which parts may be copied and how to modify them.

3. Seek professional help: If you find that you can't reduce the duplicate checking rate of your paper, you may need to seek professional help. Many academic writing centers and editing services provide duplicate checking and revision services.

4. Avoid excessive citation: Although citation is an important part of academic papers, excessive citation may lead to high duplicate checking rate. You should make sure that your citation is necessary and that you quote all the references correctly.

5. Learn and understand the definition of plagiarism: plagiarism is not just copying and pasting other people's words directly. It also includes rewriting other people's words, but there is no proper quotation. You need to make sure that you fully understand the definition of plagiarism and avoid this situation when writing.

Generally speaking, it takes time and energy to reduce the duplicate checking rate of SCI papers, but if you can follow the above suggestions, you should be able to successfully reduce your duplicate checking rate.