Investigating the Process Ni-P Electroless coating on Mild Steel Using Hot-Base Method. In the conventional method of electroless nickel-phosphorus coatings, the whole bath is heated and coated. In this research, the sample was heated in a low-temperature bath with a hot base method and the coating process of the samples was studied. Temperature and pH changes and its effect on coating morphology, deposition rate, hardness and roughness of coatings were studied. Also, the heat treatment and the determination of the abrasive properties of coatings in this study were investigated. The selected temperature range was hot in the hot base region of 130 to 190 ° C and pH was 3.6 to 5.2. It was found that the formation of nickel-phosphor electroless coating on the base of the hot base caused a significant increase in the deposition rate. The results of the study showed that in the hot base method, compared to the conventional electroless coating at pH, 5.2, the deposition rate has more than doubled. It was found that the increase in deposition rate also increases the roughness of the coating. Using the results of the hardness test, it was also found that increasing the temperature would increase the hardness of the coating, due to the decrease in the amount of phosphorus of the coating by increasing the temperature of the hot source. In the hot base method, it was possible to create a coating at lower pH levels. The high temperature of the hot source makes the coating at lower pH levels possible. Possibility of coatings at low pH, providing an electroless coating of phosphorous nickel-phosphorus. In this study, the coating was obtained at pH 3.6 and 3.2. Heat treatment studies of high-phosphorous coatings showed that the hardness of phosphorous coatings was higher than other coatings, so that the hardness of the coating after the heat treatment at a lower pH was higher than the high pH, which was due to an increase in the percentage of phosphorus, And the amount of phosphorous-nickel phases. The study of the abrasive properties of hot-dip coatings revealed that the coatings of the hybrid compared to single-layer coatings have better abrasion resistance.