The retrieval accuracy of Gband Vapor Radiometer (GVR) in Tianjin is examined through numerical simulation by using Beijing radiosonde data, which are divided into four seasons, in order to study the applicability of GVR with its own retrival algorithm in Tianjin. The results show that the accumulated liquid water retrival precision has no significant change with height. The relative deviation ranges of the accumulated liquid water in four seasons are 29% to 78%, 31% to 71%, 36% to 67%, 35% to 79% while the absolute deviation ranges are 004 to 0492 mm, 0075 to 0294 mm, 0074 to 0315 mm, 0116 to 0347 mm, respectively. The accumulated water vapor retrival precision decreases significantly in all the seasons, especially under the height of 3 km. The relative deviation range below 3 km of the accumulated water vapor in four seasons are 26% to 208%, 79% to 191%, 43% to 165%, 34% to 142%, while above 3 km are 64% to 897%, 125% to 369%, 132% to 50%, 118% to 301%. Compared with the other types of airborne microwave radiometers and ground GVRs used in the Arctic, the retrieval precision of the accumulated liquid water and water vapor in Tianjin is lower obviously.