spectrum not matching of calibration source affect the sensor measurement precision. Computer has simulated calculation with the method of multiple trapezium. It prove the relative error of measurement has existed
and the relative error proportion to bandwidth of sensor. Remote sensor with bandwidth 20nm
it is negligible for spectrum not matching of calibration source. For moderate resolution remote sensor and the whole band remote sensor
the relative error of measurement is 7.9% when the bandwidth is 300nm. It is important that adopt calibration source with spectrum matching.