The tidal analysis tool T_TIDE is used to harmonically analyze the hourly tide height data ofQingdao Port from January to December 2019. The harmonic constant is calculated and used to analyzethe tidal characteristics of the port. Afterwards,different tidal components are selected from the results ofthe harmonic analysis in the whole year of 2019 to establish a harmonic forecast model,which is utilizedto predict the tide height in January 2019. Through analyzing the results of relative errors and coefficientsof determination,an optimal harmonic forecast model is determined. The result shows the tide in this areais characterized by regular semi-diurnal tide,which is dominated by M₂ tidal component and followed byS₂ ,N₂ ,K₁ ,and O₁ tidal components. Comparing the amplitude of tidal component and average sea levelof different time lengths,it can be seen that it has almost nothing to do with the length of the tide leveldata used for harmonic analysis. The prediction accuracy tends to increase when the tidal componentsincrease from 5 to 24,while there is little further improvement by including more tidal components in theprediction,so 24 tidal components are selected for the optimal harmonic forecast model. In order to verifythe practicability of the model,the measured tidal data of Pier 5 are analyzed and used for prediction.Furthermore，it can be seen that the model can better predict the tidal changes in the sea areas near Qingdao Port．