In developing countries, sorting-composting of the urban solid residues (USR) requires the use of tools adaptable to the local conditions. To determine these optimal conditions of the process of sorting-composting of the biodegradable materials, an experiment was thrown at the level of the municipality of Chlef in Algeria. The parameters of follow-ups of the process of the fermentation were studied. The produced compost contain of the rates in N, P, K, % in Carbon (%C), % in Organic matter (%OM) and reports in C/N acceptable by the standard NFU 44 051 (the french standard of the organic amendments). The contents in elements metallic tracks (Cd, Cu, Pb, Ni and Zn) are lower than the limit standards. Also, the results of the analyses of the tests of phytotoxicity confirm that composts produced exhibit characteristics of organic amendments. These results give birth to an important crossroads for the treatment of the part fermentable of the urban solid residues in Algeria and specifically to Chief.