An overview of J c enhancement, high field performance, and an optimization of conductor design of Bi 2Sr 2CaCu 2O x (Bi-2212)/Ag PAIR (Pre-Annealing and Intermediate Rolling) processed tapes are described in this paper. The major key to the large J c enhancement achieved by the PAIR process is the improvements of both microscopic and macroscopic uniformity. It leads to the Bi-2212 phase formation occurring near the equilibrium, resulting in Bi-2212 layers with an excellent grain alignment, no impurity phase, and an excellent J c value. J e values of short specimens cut from 100-m-long PAIR tape are 380–450 A/mm 2 and 330–390 A/mm 2 at 4.2 K in 22 T and 30 T, respectively. Design of conductor geometry was optimized based on the relationship between Bi-2212 layer thickness and J c for monolayer Bi-2212/Ag tapes. J e of Bi-2212/Ag multilayer tapes (4 mm tape width, 25 μm thick Ag substrate, 4 Bi-2212 layers, 20–30 μm thick Bi-2212 layer) is estimated as 1200 A/mm 2 (4.2 K, 10 T). J e of 500–600 A/mm 2 at 4.2 K, 20 T can be expected for an optimized long tape. This excellent J e indicates that PAIR tapes are potential for practical applications. PAIR tape has a large possibility to be used for high-field insert coils.