Abstract: Objective　To evaluate clinical results of obturator prosthesisby applicating telescopic crowns and attachments in the repair of unilateral maxillary defects.Methods　Makeobturator prosthesisretented by telescopic crowns and attachments for 17 patients whose maxillary defected caused by tumor ,from June 2006 to June 2011. Masticatory efficiency and speaking functions before repairation and one month later were determined and compared with. Results　Masticatory efficiency and speaking functions were significantly increased after one month. The self evaluation of clinical effect was excellent. Conclusion　Maxillofacial prosthesis retented by telescopic crowns and attachments is an efficient method to repair unilateral maxillary defects.