Abstarct: In order to evaluation of the effect of hydrothermal priming, osmopriming and different levels of phosphorus on yield and yield components corn (zea mays L.) an experiment was carried out as factorial baxsed on randomized complete block design with four replications in Agricultural Research Station, Shahrood University of Technology. Priming factor including: non-priming as check, osmopriming and hydrothermal Priming and phosphorus fertilizer (ammonium phosphate) factor including: 0, 150, 300 and 450 kg per hectare. Results showed significant priming effects on plant height, number of seed rows per ear and ear dry weight at 5% probability level, 100 seed weight, grain yield and biological yield at 1% probability level and phosphorus fertilizer showed significant effect on plant height and harvest index traits at 5% probability and grain number per ear row, ear weight and grain yield traits at 1% probability and a significant interaction effect of priming and phosphorus fertilizer on number of seed rows per ear, plant height and grain yield at 5% probability. Hydrothermal priming significantly increased in plant height trait compared to Nonpriming. Hydrothermal priming increased significantly Number of seed per row, 100- seed weight, biological yield and grain yield in comparison to osmopriming and Nonpriming. Interaction between priming Factor and phosphorus fertilizer factor showed that hydrothermal Priming and 300 kg/ha P significantly affected plant height, Number of leaf, leaf area, ear dry weight, biological yield and grain yield. Nonpriming and 300 kg/ha P significantly affected number of seed per row. Osmopriming at 450 kg/ha P produced maximum seed row per ear and finally hydrothermal Priming at 450 kg/ha P produced maximum 100- seed weight. Hydrothermal Priming and 300 kg/ha P treatment was better than other treatments in this project.