： 【Objectives】To observe the clinical effects of the immediate implant placement of Zimmer dental implant sys? tem in the mandibular posterior region.【Methods】67 cases with a total of 89 mandible posterior teeth to deal with immediate implantion which selected to be treated with Zimmer dental implant system.76 teeth between implant and tooth socket bone wall were simultaneously filled with Bio-oss Collagen. The upper structure was repaired with PFM porcelain crown after the postoperative phase I of 3~6 months. All the patients were followed up for 6~24 months.【Results】During the clinical follow up，the implant survival rate was 100%. In 67 patients，89 implants was successfully loaded，with stable implants，good condition in synosteosis and without adverse subjective symptoms. All of the 67 patients had achieved good synosteosis and success loads clinically and radiologically.【Conclusion】A good osseointegration is obtained in the mandibular posterior re? gion with Zimmer dental implant system，Correctly dealing with Bio-oss Collagen between implant and tooth socket bone wall. At the same time，it can shorten the time of therapy，simplify the procedure，so that the clinical results are more satis? factory.