Abstract: To reveal the influence of cold wave change and extreme weather on agriculture, the variation and extreme characteristics of cold wave weather in Langfang were analyzed by the linear trend analysis, mathematical statistics and synoptic climatology analysis using the data of cold wave, temperature, precipitation, gale, blowing sand and ground temperature from 1964 to 2017. The results indicated that: (1) The cold wave weather mainly occurred from October to December and from January to April, and was most frequent in October, with the change of years, the number of cold wave days decreased obviously, but it did not reduce obviously in March and October, the beginning and the last day of the cold wave were ahead of schedule, and the last day was obviously earlier; (2) The maximum cold wave days were under the minimum temperature standard in 48 h, while the least were those under the average temperature standard in 24 h, the number of strong cold wave and the extra strong cold wave days showed a decreasing trend with the time went on, but the statistics of strong cold wave days under the standard of 48 h average temperature and the lowest