The tunneling ability of termites P. hypostoma (Desn.), with treated particle sizes of soil resulted that; the tunneling distance and number of branching were the highest with the large soil particle size, while was less at the small particle size treated with insecticides. The fine treated soil was more toxic and termites were died quickly in the tunnels than the coarse soil. Tunneling activity and number of branching decreased by the concentration increases. Treated soil with cypermethrin showed the highest and the more toxic to prevention of tunneling and branching followed by fipronil and chlorpyrifos, respectively. On the other hand the highly density and suitable quantity of added water to soil were the principal factors in tunneling activity. The statistics analysis resulted highly significant differences between the tested factors, (insecticides, particle sizes and concentrations), with the variable factor, (tunnel length and branches).