A　more　rational　scheme　of　time　reversal　transformation　is　provided.　In　the　new　scheme,　the　transition　probabilities　are　invariable　under　time　reversal　in　the　electromagnetic　interaction　processes　of　pure　sates.　But　the　evolutions　of　macro-processes　can＇t　keep　unchanged　under　time　reversal　owing　to　the　interference　effects　of　probability　amplitudes　between　non-pure　state　processes.　In　this　way,　the　so-called　reversibility　paradox,　i.e.　time　reversal　is　reversible　in　micro-processes　but　irreversible　in　the　macro-processes,　can　eliminated　completely.