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Human walking load is a dynamic excitation on supporting structures.The research on the serviceability problem of large-span structures due to human walking has been increasing in the past decade.Researchers have already proposed several deterministic human walking load models based on the periodic assumption.However, due to the existence of the inter-variability and intra-variability, the human walking load is random in nature.To solve this problem, the state-of-art wireless force-recording insole pressures were used to conduct a series of experiments on human walking load.Up until now, 1528 walking load time histories of 58 people under 11 different walking cases were collected.Based on this database, a power spectral density model of human walking load was proposed in this study.The relationship between walking frequency and peak value of power spectral density is given.A surface method is used to extend this model to all walking frequencies while considering the sub-harmonic phenomenon caused by the difference of left and right foot.This model reflects the human walking load characteristics in the frequency domain and could be used for further research and structural design.