Micro-assembly is an efficient tool to build electrical connections with metallic micro-beads. This process uses patterned photoresist AZ1512 as an adhesion for micro-bead arrangement. The assembled beads is immobilized with underfill embedment (ZYMET 2821). This method allows arbitrary geometric pattern designs. All of these processes can be completed below 150°C. This paper characterizes the electrical performance of these densely-arranged anisotropic conductive tunnels under different temperatures and stresses loading Experiment results suggest that using photoresist to assemble micro conductive beads with underfill immobilization can yield stable performance.