A data acquisition and processing system composed of dual-axis electrolytic tilt sensor is designed to increase the measurement accuracy and system linearity.The AVR SCM is used as controller in the system for the purpose of low-cost and high-precision.The PC1 and PC2 ports are used to acquire sensor data.The A/D conversion is achieved by the SCM’s ADC module.Then filtered by average.The system is able to figure out the tilting angle which changed by the small-angle generator.Experimental results show that the system can output the data of sensor tilting angle in the range of ±4′ with minimum resolution 1″ and the sensitivity is 0.2mV/（″）.The whole system has a relatively good repeatability and linearity.