Organic Rankine cycle (ORC) is a promising approach to utilize the low grade heat sources. For basic organic Rankine cycle (B-ORC), working fluid circulating pump is one of the main components with low efficiency and suffering cavitation problem. To improve the situation, organic Rankine cycle with booster pump (BP-ORC) was proposed, and an experimental setup was constructed. A stainless steel magnetic drive pump was used as booster pump which was installed between circulating pump and reservoir. Dichlorotrifluoroethane (R123) was selected as working fluid, and a scroll expander was used to produce shaft work. At the heat source temperature of 140℃, comparative experiment was organized to compare the stabilization and effectiveness between B-ORC and BP-ORC. The results showed that booster pump can overcome the cavitation of circulating pump effectively, resolve the deviation of working fluid mass flow rate obviously, and reduce the scale of oscillation of mass flow rate at the same time. The intension of oscillation was reduced from ±22 kg/h to ±2.1 kg/h. The maximum shaft power of expander was raised from 2.11 kW to 2.35 kW when the frequency of circulating pump was 7 Hz. The power consumption of booster pump was about 0.3 kW. Net thermal efficiency was raised from 5.78% to 6.16% when the booster pump consuming power was ignored, while it was fallen to 5.27% when the booster pump consuming power was considered. The results identified that the reasonable selection of booster pump is necessary.