Experiments were conducted in light sandy soil in Ismailia region to study effect of moisture amount added to ElSebay-modified trap on activity of sand termite Psammotermes hybostoma (Desn.) during 2014. The obtained results average revealed that, 500 ml water/trap gave the highest activities of termite, which were (27211.6 individuals, 4123.94 gm and 1004.56 gm) for termite attraction, soil translocation and food consumption respectively. This rate of moisture is considered more appropriate for El-Sebay-modified trap. The second of 250 ml water/trap, recorded (22147.0 individuals, 3106.36 gm and 833.46 gm) for the three tested aspects, respectively. But using 1000 ml water/trap caused the least activity (16967.4 individuals, 2657.79 gm and 752.72 gm). Increase of added water amount caused rotting and trap blockage and be unattractive to the insect. The temperature degrees and rain were effective on termite attraction and seasonal activities (soil translocation and food consumption). Data in statistical analysis detected not significant for the tested factors and inspections. It could be recommended, using of 500 ml water/trap added to El-Sebay-modified trap gave the best function with the variable climates in light sandy soil