LU Ping issued a strong message to legislators that no matter how they amended the Governor's electoral proposals, China would still reject them.
Mr Lu said China had never accepted last year's compromise electoral proposal because it violated the Basic Law.
''No matter what proposals Legco passes in the future, it is still not possible to have a through-train arrangement,'' he told TVB.
Some legislators have been working on the conservative compromise, which cuts the number of electors in the functional constituencies from 2.5 million to less than 650,000, hoping that the proposal would be acceptable to China.
Mr Lu also revealed that the preparatory committee of the first Special Administrative Region government would redefine all the legislature's electoral arrangements.
That would include the voting system, delineation of geographical constituencies for direct elections, and the nine new functional constituencies.