This paper deals with the problem of constructing tensile structures, which are defined as a type of structures that are stabilized by prestressing and have significantly less weight than conventional structures. Due to the large difference from conventional structures, it was necessary to find new methods that would enable the design of tensile structures. In the beginning, the shapes of the structures were simpler and found in nature, but the more complex ones required more advanced methods of calculation, that is finding the shape of the structure. One of the methods of finding the shape is the method of force density. A nonlinear system of equations obtained from equilibrium conditions is converted to a linear one by introducing the ratio of the value of the force to the length of the rod in which the force is. The ratio is called the force density. Over time, it proved to be insufficient, so various extensions of the method were developed. In the paper the method and its iterative application are presented and one example is described