High-temperature stress effects a change in the biochemical, physiological and also molecular changes in plants’ metabolism such as chemical analysis of molecules, destruction of nucleic acids, Reduction in photosynthesis, increase in respiration and disruption to membrane permeability. These alterations, in consequence, cause damages to plant such as inhibiting its growth and reducing the yield. This study was conducted in the greenhouses of Isfahan University of Technology to evaluate the effect of foliar application of Benzyl adenine and potassium silicate under high-temperature condition on bell pepper in a factorial experiment as a completely randomized design with four concentrations of Benzyl adenine (0, 0.06, 0.6 and 6 mg/l) and two levels of potassium silicate (0 and 5 Mm) and two temperature treatments (25±2 and 35±2 ) with six replication (repetition) for each treatment. The results of the study indicated that the use of Benzyl adenine 6 mg/l promotes growth and morphological indices, increases prolin, phenol level and antioxidant capacity. Moreover, the application of Benzyl adenine 6 mg/l stimulates the improvement in the cell membrane and decrease in electrolyte leakage in bell pepper plants compared to controlled plants. Application of level 5 mm potassium silicate made a significant impact on the fresh and dry weight of root and potassium concentration. The use of Benzyl adenine in high concentrations, particularly at a concentration of 6 mg/l, on plants under heat stress, raised growth, morphological indices, Carotenoid, prolin and phenol. Application of 5mM potassium silicate in plants under stress, increased the fresh and dry weight of root and potassium concentration and antioxidant capacity. Furthermore, the combination of Benzyl adenine and potassium silicate caused a positive effect on growth and yield. The interaction of 6 mg/l Benzyl adenine with 5 mm potassium silicate, in particular, lengthened the stalk (stem), increased dry weight of the root and SPAD index, prolin and phenol in the shoot compared to control plants. Finally, it can be concluded that simultaneous application of Benzyl adenine with potassium silicate at high concentrations, whether in optimum condition or stress one, brings about a positive effect on morphological and physiological characteristics of plants. Therefore, damages caused by high-temperature stress can be reduced by using these two compounds which in turn, promote plant growth. Keywords: Heat Stress, Benzyl adenine, Potassium Silicate, prolin, Phenol, Electrolyte Leakage