[en] Twin microstructure design in the high-temperature superconductor ${\mathrm{Y}\mathrm{B}\mathrm{a}}_2{\mathrm{C}\mathrm{u}}_3{\mathrm{O}}_{7-<!--\; ???\; -->\mathrm{\delta <!--\; ??\; -->}}$ (YBCO) with nanoparticles addition for enhanced critical current J _c is considered. The influence of the nanoparticles’ size and density on their ability to create stable twinning surroundings and increase the trapped magnetic field H _tr is theoretically analyzed. The sequence of steps to perform twin nanostructure design in the twinned high-temperature superconductors with nanoparticles addition for large H _tr and enhanced J _c is formulated. Theoretical consideration is compared with experimental measurements related to the flux pinning efficiency of the YBCO matrix with twinned microtructures formed by nanoparticles addition. (paper)