To investigate the influence of Nd∶YAG laser gingival retraction techniques on gingival retraction and the impact of painful reaction and periodontal local health in comparison with two- gingival retraction cords, 96 teeth are selected in clinic randomly and divided into two groups, two- gingival retraction cords group and Nd∶YAG laser gingival retraction group, observing the plaster model, impression and painful reaction. The periodontal parameters are evaluated and analyzed statistically after one week, one month and three months. The plaster models and impressions in these two groups are satisfying. The no pain rate in Nd∶ YAG laser group is significantly higher than that in the two- gingival retraction cords group, the difference is statistically significant (P<0.05). The probing depth (PD) values one week and one month after treatment significantly decrease compared with those before treatment, and the PD values of the Nd∶YAG laser group are higher than those in the two-gingival retraction cords group, the difference is statistically significant (P<0.05). The PD values after three months are restored to the original level, the difference is not statistically significant (P>0.05). The treatment time of the Nd∶YAG laser group is significantly shorter than that in the two- gingival retraction cords group. These two methods can both reach ideal clinical effect. But the Nd∶YAG laser gingival retraction technique has shown better features in operation, time consuming and painful reaction.