The Chinese French Oceanography SATellite Scatterometer (CSCAT) adopts a pioneering rotating fan-beam scanning system, which can provide averaged backscatter coefficients for various incidence angles and azimuth angles, obtaining high-quality wind field information from the ocean surface. Despite the innovative system design, certain inaccuracies remain in measuring backscatter coefficient, especially under low wind conditions and large incidence angles. Then the Kp value, representing the normalized standard deviation, is regarded as the function of wind speeds and incidence angles. The NWP ocean calibration (NOC) method is applied during the process of Level 1B to Level 2A data, to effectively improve the measurement accuracy. The K_p of slices indicates that the accuracy is better in the condition of about 40° incidence angle and medium wind speeds. The error analysis of wind vector cells (WVC) indicates that the measurement error is relatively large at low wind speeds. Additionally, a consistent estimate of geophysical noise has been obtained through recalibration data, and the geophysical noise accounts for 20% to 30% after excluding the very low wind speed measurements.