The preposition 基于
We use the preposition 基于 
when we need to emphasize what an action is based on, such as an assumption, an opinion or a decision.
when we need to emphasize what an action is based on, such as an assumption, an opinion or a decision.Examples
你的结论都基于假设，所以不可信
Your conclusions are based on assumptions, so they are not credible
nǐ de jiélùn dōu jīyú jiǎshè, suǒyǐ bùkě xìn
基于DNA的分类似乎更可靠
DNA-based classification seems more reliable
jīyú DNA de fēnlèi sìhū gèng kěkào
这些指控基于非常站不住脚的证据
These allegations are based on very weak evidence
zhè xiē zhǐkòng jīyú fēicháng zhànbuzhù jiǎo de zhèngjù