ing physician. The usage status of periapical film were investigated by the well designed questionnaires. The obturation quality of postoperative films were evaluated. Chi-square analysis was used to compare usage rates of periapical films of three groups. Mann-Whitney test was used to determine the relationship between the usage of periapical films and the quality of RCT. Results  571 teeth of 412 patients were investigated. In endodontists treating group, GDPs treating group and interns treating group, the usage rates of preoperative films were 95.3%, 89.5% and 92.1% respectively. The usage rates of working length films were 5.2%, 1.1% and 5.8% respectively. The usage of master point films was 94.8%, 72.1% and 97.4% respectively. The usage of postoperative films was 97.9%, 76.3% and 95.3% respectively. There were statistically significant differences among the working length films, master point films and postoperative films of three groups（P<0.05）. The periapicalfilms of adequate quality RCT and inadequate quality RCT were 3.14±0.639 and 2.84±0.736 respectively. There was statistically significant difference between periapical films of adequate quality RCT and inadequate quality RCT（P<0.05）. Conclusion  Radiographic practices of endodontists and interns are more standardized than GDPs. QualityRCT is related to radiographic practices. Standard rad

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