Objective The purpose of this study is to evaluate the quality level of Chinese clinical research about dental caries in 1950- 2005. Methods The Chinese clinical research literatures about dental caries in 1950- 2005 were collected. All the literatures were evaluated by Jadad scale. The score of Jadad scale was form 0 to 5. Score 2 and below was poor quality literature, and score 3 and more was high quality literature. The full marks of Jadad scale was 5. Results 3 201 clinical research papers about dental caries were collected, in which 46 articles were high quality literature. In 3 201 papers, random allocation methods were mentioned in 142 papers, double- blind measure were performed in 26 papers, the withdrawn and missing cases were described in 256 papers. Conclusion The high quality literature of Chinese clinical research about dental caries in scientific research design is less. The scientific research design should be strength to enhance the total quality of Chinese clinical research about dental caries.
