To deal with the problem of sparsely distributed meteorological stations in the Dalian area, the simple and practical adjusting methods of monthly mean temperature series are presented. There are seven basic meteorological stations, and their temporal meteorological stations are used as correction stations. A set of onedimensional linear regression equations and differencevalue correction equations for the monthly mean temperature series are built based on the data from 12 temporal meteorological stations and the corresponding basic stations. Comparison analysis is made from the viewpoint of statistics and error correction. The results indicate that there is no remarkable difference between two methods, and both can be applied in adjusting monthly mean temperature series in the Dalian area.