The differences between efficiency of test and practical efficiency and the aspects needed to be considered when testing filter for bio-protection are discussed at the end.

The orientation and main tasks of the information research on bio-defense;

Practice of biological protection for side slope of high-grade highway;

It introduces high-class road slope biological protecting technology, elaborates the principle of slope protecting plants’ choice, points out that high-class road slope biological protection is an important part of road maintaining and virescence, also a important guarantee of safe and expedite road.

This articles aims to provide some theoretic basis for the rock slope landscaping research workers and designate a clear-cut direction for the research through the analysis on the current situation of research on biological protection for rock slopes in China.