At the background of the adversary system, expert witness system emphasizes that the adversaries participate in the procedure and play an important role in the lawsuit.

• 专家证人制度以当事人主义诉讼模式为背景，强调当事人在诉讼中的作用以及对程序的参与性，当事人可以自行聘请专家证人参加诉讼，专家证言需经双方当事人及法官询问后方可被采信。