When the parties select competent court by agreement, the courts of common law countries sometimes may use public policy of "choice of law mode" and "law and regulations priority mode" to deny the validity of jurisdiction clause. 在当事人协议选择管辖法院时,英美法系国家法院有时会运用法律选择模式和法规优先模式公共政策否定管辖权条款效力;