In the design and application of the shortwave communication system,the characteristic of shortwave channel propagation,channel loss,characteristic of ionosphere structure should be adequately considered.But the information in this aspect is too old or not exact,and most of them are only theoretical foundation.A system of short wave channel detection based on height indicator made in China was designed,which can measure the channel link loss and frequency characteristic of the shortwave communications link timely and accurately.It has important auxiliary significance for the design and application of shortwave communication system,and the experiment results verify this conclusion.