not in Young Sampling of arthropods soil fauna were made with the objective of comparing the composition of the communities of these invertebrates after three years of the fire on the Pine forest from Jose del Carmen Ramirez National Park. Two areas with different affectation were sampled: high impact of fire area (AAI) and medium impact of fire area (AMI). These areas were compared with an area that had not suffered any impact: control area (AT). The Shannon diversity index calculated for each area was similar. On the other hand, the similarities in the composition among all areas were very low. Comparing to AT, the AAI lost 13 families and the AMI lost 17. However, new families appeared (8 in AAI and 15 in AMI). The Opiliones and Diplopods are the groups that were more affected with the bum of the vegetation, losing all the families detected in the AT. The Hymenoptera (Formicidae, Evaniidae y Braconidae), as well as all families of Heteroptera and Thysanoptera, the spiders (Ctenidae & Philodromidae) and the opiliones Sclerosomatidae, are groups apparently opportunistic that increased and colonized the empty niches left by those more sensitive groups to the variations of the soil. The cockroaches (Blattodea) were the most abundant group in general in the three areas, representing 24% of the total of the captured individuals and reaching 7 ind / m: of density. The estimated families for each area, show very similar proportional values, approximately one third of observed families has not been recorded yet in the study areas. Key Words: Soil arthropods, Pine forest, National Park, Dominican Republic Arthropoda (Animalia). Spanish none2009checked