Abstract: An implementation scheme of local BCU installation is introduced in this paper. The BCU is divided into two parts in this scheme, namely, the fundamental BCU and auxiliary BCU, in principle, the former one includes measurement, position acquisition of circuit breakers and isolators and control function, the signals of this part can be standardized, but at present, for the differences of primary equipment, the pressure blocking and binary input and output (BIO) acquisition (BIO) are hard to be standardized, so the signals of this part are acquired by the auxiliary BCU and directly sent to station control level through MMS network. The scheme effectively solved the problems of large quantity of binary input and binary output and the different binary input quantity of primary equipment.