Objective To learn the camparison between the two methods of injections of part anesthesia of stomatology.to provide the evidence for the new painless injection of the value of clinical.Method We sample randomly choose 60 patients.divide into 2 groups.30 patients per group One group uses the new way of injection.another group uses the traditional way.According to the anpraise for the feeling of the injection and the comparison of the countenance after injection.analyze by the statistics.Results By 60 patients.succeeds except one patient.the rate of painless is 76.67 %;the rate of painless for another group which uses the traditional way of injection is 3.33 %.the difference between the two group is striking（p<0.05）.Conclusion The way of new painless injection is simple

with no complications.Compared with the traditional way

the way of new painless injection is more effective.