In this paper,we propose and demonstrate a compact silicon photonic current sensor based on Si dual-ring resonator.The output power of the designed dual-ring resonator is h ighly sensitive to the effective refractive index of the TE mode propagating in the ring.The dual-ring resonato r is fabricated on silicon-on insulator (SOI) by the CMOS compatible process,and the TiN resistors with high h eating efficiency are fabricated in the ring.The current flowing through the integrated resistive TiN heater produc es Joule′s heat and changes the temperature,which results in the change of refractive index of the TE mode.Fin ally,the output power of the dual-ring resonator is changed.In low current,the output power of the dual-r ing resonator has almost a linear dependence on the current flowing through the TiN heater.A photoelectric detect or is used to measure the change of the output power under different input currents. Our experimental results show that the proposed sensor achieves a sensitivity of 1575dBm/A and a g ood l inearity (R²＞0.999) in the test range of 0－6mA.Th e footprint of the sensor is 70μm×90μm ,which is quite compact for on-chip current sensing.Meanwhile,the proposed sensor can be applied in areas such as electronic pulse detection and i ntegrated optoelectronic interconnects.