Refuse plastic fuel (RPF) as materials for the recycling processes (Materiel Recycling) present difficulties with the mixing, the demolishing, the molding and the drying steps. While using RDF as a fuel by pyrolysis, accompanying tar and soot causes many problems like clogging, the corrosion and the erosion of the chloride channel. Using the intermittent pyrolysis equipment during the decomposition of the RPF gases H2, CH4, CO and among the by-products of Cl2 and HCl, Tar is produced in a large quantity. With understanding the by-products decomposition system of the Cl2, H2, Tar and the gases H2, CH4, CO we can understand the nature of the generation of the products. The experimental conditions were chosen according to the temperature of the decomposition (300 ~ 900oC), While varying RPF 2 g, pyrolysis temperature 700oC during a holding time of 32 min : the H2 gas 1.71%, CH4 2.54%, CO 4.63%, Cl2 12.86 ppm, HCl 30.2 ppm were composed. Also light tar benzene 18.45 g/m3, naphthalene 0.86 g/m3, anthracene 0.09 g/m3, pyrene 0.04 g/m3, gravimetric tar 31.8 g/m3, and char 0.45 g was formed.