Abstract:In ecological protection technique of rock slope, as a new slope protection technique, the selection of substrate is the most important. The laboratory tests are carried out to determine the influencing factors of water, soil, cements, and compound material of organic matter and fiber. The orthogonal analysis method is used to evaluate the primary and secondary relations to the index. At last, the optimal scheme and optimal technological condition for the influencing factors are proposed, which show that, (1) in order to obtain the maximum strength of 7 day lasting test, the optimal combination of each factor is A2B2C2D4, that is 120 g for cements, 820 g for soil, 220 g for compound material of organic matter and fiber, and 1 200 g for water; (2) in order to obtain the maximum strength of 14 days lasting test and 28 days lasting test, the optimal combination of each factor is A2B2C2D3, that is 120 g for cements, 820 g for soil, 220 g for compound material of organic matter and fiber, and 1 100 g for water.