Abstract: A comparatively long series of temperature data over Liaodong Peninsula has been offered in the present paper. The fluctuation feature of annual temperature bears a strong resemblance to that of the hemispheric average temperature, but the long-term temperature trend of the area is a little difference from that of the hemispheric average. The Peninsula's winter has become much warmer since the beginning of the century, while its summer has surprisingly become cooler. As a result, the annual temperature change is not yet so noticeable as expected. The contribution of the cities' growth and the changing heat island effects to the increase of winter temperature has been discussed. Also discussed are the possible causes of the obvious winter warming and the unusual summer cooling in the studied area.