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Owing to the limitation on infrared detector size, most of infrared remote sensing cameras still utilize scanning system to extend effective field of view (EFOV). With the elevation of angle measurement precision requirement, the precision of scanning system is demanded to improve continuously. Therefore, high accuracy and large range angle measurement is a crucialelement for performance on remote sensing camera.The scanning system max scanning range is ±5.8°, and precision is superior to 1". An online detection method for scanning system angle measurement precision is researched to satisfy the requirement of a domestic infrared remote sensing camera. According to investigations on high accuracy angle measurement technique at domestic and aboard, a special laserinterferometer with functions on large range and high accuracy online angle measurement is introduced to implement angle measurement precision, LaserInterferometer with SIOS SP-TR2000 is introduced to measure angle of mirror in scanning system. SP-TR2000 interferometer is calibrated on distance measurement in original application,For the application on angle measurement, it is essential to calibrate using RENISHAW LaserInterferometer and RT300 rotary table, The calibration result with SP-TR2000 accuracy is 0.245”, satisfying the requirement of scanning system 1”. The scheme of online measurement is including static and dynamic testing, according to the error analysis, the on-line angle test system error is 0.247”,measurement system and method with SIOS SP-TR2000 LaserDual-Frequency Interferometer is feasible and effective, and it is a new aspect for large range and high accuracy angle measurement.