In order to analyze and evaluate the detection ability of wind profile radar by data availability, the wind profile data in 2012 was statistically analyzed. Results showed: both data availability and signal to noise(SNR) vary with seasons, and the detection capability in summer is stronger than that in winter; according to the requirement of 80% data availability, 3 km effective detection height of the boundary wind profiler in non-precipitation weather and 0.6 km optimal connecting height of low and high model are determined. SNR decreases with height according to logarithm monotone law in non-precipitation weather, and the decreasing degree of SNR's attenuation in summer is bigger than that in winter, while in rainy weather, SNR follows linear function law and its slope ranges from -10.44 to -2.47, and vice versa.