Abstract: Abstract：Objective To compare the effect of two ways’ impressions in edentulous jaws prosthodontics：jaw-closing impression and jaw-opening impression. Methods Thirty cases of complete denture patients were chosen， and randomly divided into two groups；complete dentures were made by jaw-closing impression and jaw-opening impression respectively， then the adsorbability and sore spots modifications were checked after three months. Results The adsorbability of complete denture fabricated with jaw-closing impression technique was better and the times of sore spots amendment were less. Conclusion In fabrication of complete denture， jaw-closing impression technique with silicone rubber materials is better than jaw-opening impression technique.