These four characters form two parallel pairs: 追本 (zhuī běn) - “chasing the root” - and 溯源 (sù yuán) - “tracing the source upstream.” Together, they create a powerful and vivid image of a deep and thorough investigation that goes all the way back to the very beginning.
The concept of 追本溯源 is deeply embedded in Chinese culture, which places a high value on understanding fundamentals. In philosophy, traditional medicine, and scholarship, getting to the “root” (本) is considered essential for true knowledge and effective action. Merely dealing with the symptoms or “branches” (末, mò) is seen as a temporary, superficial solution. A close Western concept is “root cause analysis,” often used in business or engineering. However, 追本溯源 is broader and more philosophical. While “root cause analysis” is a specific methodology, 追本溯源 is an approach to life and learning. It suggests a patient, scholarly, and almost historical investigation. For instance, you wouldn't just analyze why a company's sales are down this quarter; you might 追本溯源 to understand the founder's original vision and how the company has strayed from it over decades. It's about understanding the entire narrative, not just the final data point.
This is a formal and respected term. You won't hear it used for trivial matters like finding your lost keys.