In this work, I present the change in the structure of compound bows. I studied the design of bows in detail. After examining the material and production technology of the bow arms, the modeling of the bows is also discussed. After researching the literature, I used them to examine the sports equipment. In order to learn about the important parameters of bow limbs, we carried out material tests. We tested three major brands of compound bows. We tested by making lightened test specimens from the bow limbs. Bending tests and tensile tests clearly showed the properties of the bow arms. The bending test and tensile test results of the three major brands were detailed and compared, and they were presented with common diagrams. Thanks to the microscopic images, the bow manufacturing technology was clearly defined. After summarizing the results, the first conclusion was formulated and the most important plans for the near future were also discussed.