For example, I want to propose a new algorithm for an existing problem, and I already have published several papers about this topic, they share exactly same background, is it OK for me to copy the "background" and "related work" part from my published paper?
The background contains some already well-studied techniques, in order for the paper to be self-containing, they should be briefly introduced (instead of just being cited).
I don't see the meaning that I have to express the exact same thing in a different way for every new paper
Answer
This is called "text recycling" or even "self-plagiarism" and generally frowned upon by editors. It's better to avoid it as much as possible, even if it results in more work, particularly for non-native speakers of English. Too much overlap can result in rejection or later retraction, where "too much" is at the discretion of the editor. You are also very likely to annoy reviewers if they notice the overlap with your previous publications.
The Committee on Publication Ethics has the following guidelines for journal editors:
When should action be considered?
Text recycling can take many forms, and editors should consider which parts of the text have been recycled. Duplication of data is likely to always be considered serious (and should be dealt with according to the COPE guidelines for duplicate publications [1,2]. Use of similar or identical phrases in methods sections where there are limited ways to describe a common method, however, is not uncommon. In such cases, an element of text recycling is likely to be unavoidable in further publications using the same method. Editors should use their discretion when deciding how much overlap of methods text is acceptable, considering factors such as whether authors have been transparent and stated that the methods have already been described in detail elsewhere and provided a citation. Duplication of background ideas in the introduction may be considered less significant than duplication of the hypothesis, discussion, or conclusions.
When significant overlap is identified between two or more articles, editors should consider taking action. Several factors may need to be taken into account when deciding whether the overlap is considered significant.
Text recycling in a submitted manuscript
Text recycling may be identified in a submitted article by editors or reviewers, or by the use of plagiarism detection software, e.g. CrossCheck. Editors should consider the extent of the overlap when deciding how to act. Where overlap is considered to be minor, authors may be asked to re-write overlapping sections, and cite their previous article(s). More significant overlap may result in rejection of the manuscript. Where the overlap includes data, Editors should handle cases according to the COPE flowchart for dealing with suspected redundant publication in a submitted manuscript [1].
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