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As an important supplement to the S-band new generation weather radar, Guangdong Province has accelerated the construction of X-band dual polarization phased array weather radar. How to better optimize the layout, improve the coverage and detection ability of the whole network, and whether the site selection is scientific and reasonable is particularly important. In this paper, a new intelligent analysis and evaluation system of detection environmental parameters based on digital elevation DEM is designed to objectively, quantitatively and automatically calculate the detection clearance projection area, the proportion of clearance to the total projection area, the proportion of projection blocking area, the detection clearance volume, the static cone blind area volume, the low altitude blind area volume, the scanning three-dimensional airspace integrity, etc, Be able to output the comprehensive evaluation results and suggestions within 1 minute when selecting the site. As an auxiliary site selection system, it has been applied in the site selection of 26 X-band dual polarization phased array weather radars in Guangdong Province. The output conclusion plays a good guiding role in site site selection and provides a scientific decision-making basis for the construction of radar system.