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Considering the quality of CINRDA/SA weather radar base data, the calibration techniques are studied. Based on the principles of echo intensity calibration, the test methods, procedures and technical requirements are discussed in detail, and the unified calibration methods and operating flows are also formulated for CINRDA/SA, which eliminates human or test errors of radar echo intensity calibration to maximum extent. On account of the uncertainty of radar parameters measured in factory, in Jiangsu Province, the actual length of waveguide and loss in transmission lines are exactly measured. A specialtest waveguide is developed to measure the loss of transmission and reception lines in radar stations. All the correction of loss measured above is applied to echo intensity calibration for CINRDA/SA. The sun considered as a microwave signal source can test the echo intensity of reception lines, which is conducted by combining solar flux density with solar power received by radar. The comparative analysis of radar echo intensity between two or more weather radars provides a reference for radar network systems.