Abstract: Civil aircraft obtains the flight height, speed, etc. by the air data computer with the measured static pressure, total pressure and other basic parameters as input. Therefore, the flight safety strongly depends on the accuracy of the static pressure measurement which is related to the aerodynamic layout of the static ports. For subsonic civil aircrafts, the pressures measured by static ports are mainly affected by the Mach number, angle of attack(AOA) and the configuration of the aircraft. Based on CFD results, the positions of static ports are determined by the mean square deviation method. The measurement characteristics of static ports and the disturbances on measurement due to the flap/slat, spoiler, landing gear and ground effect which are essential inputs for the static source error correction (SSEC) were obtained by wind tunnel tests.