Because I found that there is still room for improvement in other people's patents, I continued to write on his basis. So if I use the existing technology, the original patentee will sue me for infringement, so how can I avoid the original patent? -Most patents are not impeccable. You can carefully study the other party's patents, especially the claims (if you don't have time, you can only focus on the claim with the largest scope of protection, that is, the independent claim). As long as your claim does not include all the technical features of the other party's claim, your technology is not infringing. If, unfortunately, all of them are included, then you must see whether your invention is exactly the same as his purpose, technical scheme and effect. If they are different, you can also defend them from this aspect. You can also see if you can transform one or part of the technical features (not simply equivalent replacement, but creativity). There is really no way out, so go and search to see if there is any existing technology before his patent appears. If there is, don't be afraid, you can also sue him for invalidation. The last way is to discuss with each other whether we can cross-license, so that everyone can use each other's patents.
Is this a good answer? Hope to adopt, thank you.