Abstract: According to the on-line error detection requirement of embedded processors, this paper presents a parallel error detection structure of SPARC V8 architecture compatible ALU, which takes the B0 encoding of Berger code prediction as the parallel on-line error detection strategy.This structure can be integrated into the SPARC V8 architecture compatible ALU directly, and forms a parallel error detection ALU.Comparing with the two-rail logic method, this structure gets the hardware cost decrease.Comparing with pseudoduplication method, in which the same circuit successively processes data twice but along different data path, this structure has an obviously performance advantage.