Abstract: The Euler model and RNG k-ε turbulence model were used to calculate the unsteady numerical value of bulb turbine to study sediment particles' effect on the pressure pulsation in the passage of bulb turbine. The effects of sediment particles on the pressure pulsation characteristics in single-phase and two-phase flow were analyzed. The effects of different sediment physical parameters on the period and coefficient of pressure pulsation were compared. The factors influencing turbulent kinetic energy distribution were explored in the guide vane and blade's middle section. The results show that the pressure pulsation mainly comes from the blade passing frequency and the draft tube low-frequency pulsation. The influence of blade passing frequency is gradually weakened from the guide vane inlet to the draft tube. The influence of the draft tube's low-frequency fluctuation gradually increases from the guide vane's inlet to the draft tube. The sediment-laden flow changes the original periodicity of pressure pulsation under the condition of clear water. At the runner outlet and draft tube, the pressure fluctuation coefficient will fluctuate violently. Under the two-phase flow condition (D_p=0.1mm, C_v=1%, ρ=2600kg/m³), the fluctuation range of the pressure fluctuation coefficient at the draft tube in time-domain increases nearly ten times. The main distribution of high turbulent kinetic energy in the middle section of the guide vane and blade is affected by the rotation circulation, flow direction, sediment settling direction, and sediment mass flow per unit volume.