This paper discusses two problems on calibration of windprofiling radar. Firstly, based on the calibration principle of echo intensity, it analyzes the effect of variations in transmitted power and receiver gain on measurement accuracy of echo intensity using weather radar equation. In addition, it puts forward a method to improve measurement accuracy of echo intensity by measuring sampled transmitted pulse and backscattered power at the output of digital receiver during each pulse repetition time. Secondly, according to calibration principle of velocity, it analyzes the image spectral component caused by imbalance in amplitude and phase of I/Q signals in velocity calibration. Moreover, it presents a correction method based on statistical characteristics of time domain signals. What’s more, simulation experiment is conducted using mathematic models for I/Q signals. And the result shows that this method can suppress the image spectral component effectively.