Using the ERA5 single-layer reanalysis data combined with the planetary boundary layer tower (PBL tower) meteorological observations from a north-south climate transition zone mountainous forest in Huainan as forcing data, we evaluate the applicability of the Community Land Model (CLM4.5) against observed canopy flux and micrometeorological data at this site. Also three experiments to study the impact of soil texture on soil moisture are designed to improve the model performance. The results show that overall CLM4.5 performances good in Huainan mountainous forest, and the simulated results driven by observation is better than that of ERA5 data. In terms of radiation simulation, both the simulated results of the radiation components using ERA5 data and PBL tower observation data are good, especially driven by PBL tower observation, and the correlation coefficient between the simulation results and observations throughout the year is more than 0.97, and the root mean square error is below 25.056 W m-2. The correlation coefficient of the ERA5 forcing simulation is slightly lower, but it also reaches 0.92, and the root mean square error is below 29.939 W m-2; In terms of soil temperature, both the correlation coefficients reach more than 0.98; the correlation coefficients of soil moisture results are all above 0.86, but systematically higher; and the average correlation coefficients of the simulated results of the sensible heat flux are 0.72 and 0.78, respectively. Through the comparison simulating tests of three soil texture parameters, it is shown that the simulated results of the soil moisture with the measured three layers of soil texture plus the data of the deep soil texture are closest to the observation. Thus the accurate description of the soil texture can greatly improve the simulation of soil moisture. But further tuning of the parameters or parameterization scheme is still needed. In addition, the ERA5 reanalysis single-layer data as forcing in this site are reliable, and thus can be used in the further simulating work. This study could be useful for further study of land and atmosphere exchange in the north-south climate transition zone of Huainan, China.