Abstract: The biosystem is a complex system, which possesses characteristics of purpose, integrality, hierarchy, dependency, adaptability, open, evolution, self-organization, et al. The bioscience has already developed into systems biology, it is inevitable choice to study the bioscience guided by systematic perspective. Using the systematic perspective to know the biological law of motion, it is necessary to do, such as, basing function to deduce logic, emphasizing many directions and nonlinear thought to think. The analytical method of “5W1H” is very useful and efficiency for knowing the biosystem knowledge.

Key words: biosystem, biological cognition, systematic perspective, “5W1H&rdquo, analytical method