Abstract: Compression tests and direct shear tests are carried out to study the deformation and the shearing strength characteristics of compacted Malan Loess in L#x000fc;liang region. Analyses are made on the relationship between the initial compaction degree as well as the initial water content and the shear strength indexes and on their effects on the compressive deformation of soil. By employing secant modulus method, the modified formula of deformation is established, when initial compaction degree and initial water content of compacted Malan loess has been changed. The results of the research show that the relationship between the initial water content was well as the initial compaction degree Kand the cohesion cas well as the angle of internal friction is linear, and that the relationship between the confined compression strain #x003b5;and the vertical pressure pcan be formulated as #x003b5;=kpⁿwithout consideration of the effects of compaction degree and water content. Moreover, the results indicate that the relationship between the secant modulusE_soiand Kis linear and that the relationship curve betweenE_soiand 1/wis similar to a parabola. Hence, when the initial compaction degree and the initial water content have been changed, the modified formula of deformation can be used to analyze and calculate the deformation compacted Malan Loess in L#x000fc;liang region.