Based on the model test, this paper studied the wall pressure and the pulsation characteristic of flood discharge tunnel with horizontal swirling flow. Results indicated that,for various flow patterns,wall pressure increase with the H and h increases,and the longitudinal wall pressure decreases along the tunnel.In the scope of Z/D=0.5～4.5,the intensity of pressure changes sharply,the nature of transition section is extremely obvious,the rule is different when the fluid pattern is different.The basic frequency of pulsation pressure,which belongs to the low frequency scope，is in 0.03~1.6 Hz.The dominant frequency mainly concentrates in 0~20 Hz；The amplitude probability distribution of wall pulsation pressure is in the Gauss normal distribution;but in the head (Z/D=0~4.5) and tail (Z/D=29~horizontal section export) of the level section Cs,Ce are larger than the theoretical value slightly.
