For three-dimensional polymers based on the dimethacryloil derivatives adipic and sebasinoil acids and dicarbonyloxyethylene we have established the influence of the deformation velocity (V-epsilon) on their behaviour under the conditions of the uniaxial elongation. With the increase of V-epsilon up to a distinct value of V-epsilon l, the ultimate stress sigma(m) for of the polymers grows, but at V-epsilon > V-epsilon 1 the value of sigma(m) decreases. This phenomenon is explained. With the rise of V-epsilon, the module of elasticity E-1 increases and the curves sigma(epsilon) are shifted to the left along the epsilon axis. The change of the character of the structural organization of three-dimensional polymers in the deformation process of their samples was established.