The source and cause of cognitive load (CL) and situation awareness (SA) in digital human-system interface (DHSI)
is explained. Based on the analysis of cognitive procedure and the relation of CL and SA, The relationship model of CL
and SA in DHSI is put forward. Using the association target and the relationship model of CL and SA, the method and
strategy of information visualization of DHSI is presented which is based on the cognitive psychology. Selecting the
Boeing 757 autopilot as the case, the comparison of design is shown.