Mechanical properties of four kinds of thermoplastic elastomers with similar PS content and different molecular architecture were investigated: trifunctional and tetrafunctional PS-g-polyisoprene (PI) multigraft copolymers, H-shaped PI-PS graft copolymers and LN4 16-68-16 with two PS outer blocks and a random polybutadiene (PB)-PS middle block. All of samples are phase separated and form alternate PS and rubbery lamellae. Multihysteresis measurements showed that with increasing complexity of the molecular architecture and decreasing domain spacing (from multigraft copolymers to H-shaped graft copolymers and LN4) the residual strain decreases obviously. For tri- and tetrafunctional multigraft copolymers, which have same domain spacing, increasing functionality were found to improve the elastomeric character of the investigated materials. In a conclusion, the domain spacing is the most dominant factor on the hysteresis properties and molecular architecture (difference of functionality) is the second one, within the studied range PS content has no obvious influence on the hysteresis properties.