Based on field test，the influence of non-structural factors such as ambient temperature and operating environment（added mass，pedestrian walking frequency）on modal parameters of the steel-glass pedestrian structure is studied. The mathematical model between temperature and structural modal parameters is established，and the influence of additional mass and pedestrian frequency on structural modal parameters is analyzed. The results show that the change of modal frequency and damping ratio caused by temperature change in one day can reach 2.17% and 87.1% respectively. At the same time，a linear fitting expression of the first three vertical modal frequencies with respect to temperature variation is given. From the end of the structure to the middle span under the action of additional mass，the modal frequency decreases gradually，and the damping ratio increases gradually. The increase of additional mass leads to high modal frequency and lower damping ratio. According to the statistical rule of a large number of experimental data，it can be seen that the footstep frequency has little influence on the modal frequency of the structure under the action of pedestrians. Therefore，it is of great significance to analyze the influence of non-structural factors on structural modal parameters for structural health detection and damage identification.