Fabrication of large high temperature bulk superconductors has a great impact on various industrial applications. However, it has been difficult to grow a large grain bulk on ground due to the contamination from the substrate or the crucible. This problem can be solved in microgravity snvironment, in which the bulk can be supported by a seed crystal alone during the crystal growth. Such experiments were conducted in the USERS (Unmanned Space Experiment Recovery System） project. Unfortunately, we could not grow large bulk superconductors in space. However, through this project we learned several interesting features for processing of bulk superconductore on the ground. This achievement will allow us to find new industrial applications of bulk superconductors.
