It is found out from practice that the traditional method for measuring the horizontality of the antenna pedestals of CINRAD/SC weather radar is difficult to use at a common radar station, and the measurements contain obvious errors. The steps to improve, in combination with the revision and processing of the data to be checked, are presented. With the method, the checking process can be shortened and simplified obviously. The outcomes after treating with mathematical methods are more close to the true values. The method can also be used for other types of weather radars.