Patients with AECOPD will participate in a rehabilitation program for one week. Participants in the proposed study will be randomly divided into two intervention groups:controlgroup and EDP therapy group. Before using EDP,the investigators will measure the relevant parameters of lung volume , diaphragm electromyogram, diaphragm activity and other basline index. Then EDP will be applied to investigate the effects of EDP on the above mentioned respiratory mechanics parameters.
