Typical crossarms of multi-circuit high-voltage transmission tower have been tested in a wind tunnel using high-frequency-force-balance technique to investigate the characteristics of wind forces acting on them. The results indicate that along-wind wind force is the major load on the crossarms for the static wind effects, while magnitudes of the along-wind, across-wind and torsional fluctuating loads are in the same level and each of them cannot be ignored. The drag coefficients of crossarms go for maximums at 0° wind direction and basically decrease with the incoming wind directions. By comparing the lift coefficients of testing models, it can be seen that the lift coefficients of crossarms have a great relationship with the length of side arms, with the increasing of side arm’s length, the lift coefficients will be larger. At same time, some exiting codes about drag coefficients are compared with testing results, it turns out that the testing results are very close to the code values, but all of the codes don’t consider the impact of life force and the torsional moment acting on the crossarms. In addition, the correlation of along-wind, across-wind and torsional forces is small; wind field has some influence on the correlations.