The present thesis report titled "Evaluation of the ecological and economic impact of the agricultural and forest systems installed in the high, halfway and low basin of the Cumbaza River - Region San Martín - Peru" has as goals: Evaluating the impact of 05 different systems to use the land over ecological indicators as the CO2, Carbon, water and oxygen; and determining the economic impact of agricultural and forest systems in 03 communities of the Cumbaza river's basin. The activities were developed in the localities of the High ( Chiricyacu ), Halfway ( Aucaloma ) and Low ( Rumizapa ) Basin of the Cumbaza river. I selected five agricultural families as sample for each one of the implicated communities (Chiricyacu, Aucaloma and Rumizapa).The selection of the families was proportional, stratified and at random, considering 5 systems of using the land, considerate as treatments. The desi...