诉之合并制度(klagenhaufung)在民事诉讼法上有丰富的理论价值和实践价值。“民事诉讼法上之诉讼合并制度旨在使当事人可以节省劳力、费用和时间,并以防止裁判抵触为其作用。所以各国民事诉讼法均有共同诉讼之设定及诉之客观合并之规定。”诉之合并制度孕含着诉的要素理论和诉讼标的理论等基本诉讼法 The merger system (klagenhaufung) has a wealth of theoretical and practical value in the civil procedure law. “The lawsuit merger system in the civil procedure law aims at saving the labor, the expense and the time, and prevents the refusal of the judge from being its role .Therefore, the civil procedure law of all countries have the provisions of the common lawsuit and objective merger of the lawsuit . ”The merger system of appeal contains the basic procedural law such as the element theory of litigation and the subject of litigation