In order to meet the sustainable development goals, global policies are strongly oriented towards the valorization of local materials such as agricultural by-products. Cameroon integrates this important concern into its development strategies, taking into account the environmental protection aspect. It is in this context that our study proposes the development of compressed earth bricks ‘BTC’ stabilized with sissongo straws (Pennissetum purpureum). The main objective of this work is to study the effect of using vegetable straws, in particular the sissongo straws on the mechanical properties of compressed earth blocks and its sensitivity to water, through its total absorption. Tests (particle size analysis, water content, Atterberg limits, specific gravity, modified Proctor) were conducted on Yabassi soils; water content test was conducted on sissongo straws; compression, bending and absorption tests were conducted on compressed earth blocks. For the preparation of the mixtures, 0%, 0.05 %, 0.1 %, 0.2 %, 0.3 %, 0.4% and 0.5% by dry weight of substitution of soil by sissongo straws were used based on previous studies that used the same percentages for rice straws in the manufacture of earth bricks and a compaction pressure of 3.43 MPa (maximum pressure of the hydraulic press). The results showed that the addition of these materials to 0.3 % straws gave a maximum compressive strength of 3.058 MPa and contributed to the improvement in compressive strength of bricks of 1.1 MPa, compared to that of controlled specimen 0% straws (1.95 MPa). Although our ‘BTCs’ in the building are not really experimenting bending, we have subjected the specimens of each formulation to tensile test, the maximum bending stress recorded was that of the specimen containing 0.4 % straws with a stress of 0.367 MPa. The test pieces containing 0 % to 4 % have respective absorption coefficients of 4.5 and 2.06 which are within the recommended range of (2 to 15). Absorption time by capillary action is greater for 0 % straws incorporation (30s) than that containing 0.3 % straws incorporation (14s). Finally, recommendations were made to take full advantage of stabilized compressed earth bricks with Sissongo straw (Pennissetum purpureum) in construction. Emphasis was placed on environmental, economic and social benefits.