Abstract: Objective: To evaluate the effects of the fiber post system in the repair of residual crowns and roots of incisor. Methods: Fifty-two incisor teeth in 30 patients were treated with oral examinatin,removing the bad restoration,completing root canal therapy, periodontical treatment and necessary surgery. The patients with healthy periodontal condition and without discomfort within one week were prepared,then they were treated with tooth preparation combined with all-ceramic crown restoration according to the principle of full crown preparation( including trying to save the health of dentin,sticking post and nucleation). Thirty patients were followed up for 6 to 12 months,the effects were evaluated by radiology and clinical examination. Results: Post detaching in 1 case and post fracture and gingival congestion in 1 case were found,the good restoration margin,stable colour,good healthy gingiva,no abnormal root and post and secondary periapical paradentitis in other patients were found. Conclusions: The effects of fiber post on repairing the residual roots and crowns of incisor teeth are good. The fiber post should be carefully selected in the treatment of root canal with less residual tooth tissue and no enough dentin shoulder collar.