Evacuees of a great disaster of an earthquake as the Great East Japan Earthquake or Kumamoto Earthquake made partitions by cardboards to keep their personal space at a shelter. Although a cardboard is able to get easily at a shelter, is able to make various form as demand and have moderate strength, the cardboard was inept in acoustic material as an absorbent or an insulator to keep their privacy. Therefor we have be trying to improve acoustic characteristics of a cardboard. At the start of the study, we studied out an evaluation method for cardboard with two microphone method using only two microphones that could evaluate not only an acoustic absorption but also an acoustic transmission coefficient. This paper introduces the point of the evaluate method and a measurement result of sample cardboard.