Purpose: theoretical and experimental substantiation of the use of rational methodology for improving technical and tactical training of tennis players of 10-12 years with the use of specialized technical devices. Material and methods. The study was attended by 24 tennis players from the sports club "Polytechnic" of the National Technical University "Kharkiv Polytechnic Institute", 12 athletes were included in the experimental group and 12 in the control group at the age of 10-12 years. The experiment was conducted during three months in the preparatory period at the stage of basic training of the second year of study. The experimental group trained for the advanced technique of technical and tactical training using a special "tennis gun", pulse meters and video devices. At the beginning and at the end of the experiment, the target precision of the target was tested at the given area of the court and using the pulsometer "Polar" the heart rate was recorded at the beginning and at the end of each completed series of strokes and each exercise. Results. The proposed technique of improving the technical and tactical skill of tennis players with the use of technical devices has had a positive effect in the training process with the installation of their target accuracy and the functional state of athletes. The obtained data testify to the expediency of using this technique for the preparation, control and evaluation of competitive activities of tennis players 10-12 years. Conclusions. The positive influence of the proposed methodology on the adaptive capacity of the body of athletes to loads is determined. The method of improvement of technical-tactical preparation with the use of technical devices is offered in the work. It allows for a short period of time to effectively improve the state separately as technical and tactical skills. The developed method is an affordable and effective means of raising the level and reliability of competitive activities of athletes.