An ancient diary named “Weng Tonghe Diary” written in the late Qing Dynasty by Weng Tonghe and edited by Chen Yijie was dug out in this paper. First of all, every sand dust record was extracted from this diary. Based on the records of full months, the general status and evolvement character of sand dust weather in Beijing during 1860~1898A.D. were analyzed statistically. It is found that, (1) The average sand dust days of Beijing during 1860~1898 A.D. are 10.4 days which are more than average frequency of 1990’s even ignoring the difference in the standard on sand dust. (2) Sand dust weather mainly arose in spring weight of which reaches 70%, in which the weight of April and May is over 50%; and winter is the second high frequent season weight of which is 20%. (3) Comparing with 1961~2000 A.D., sand dust process during 1860~1898A.D. was more highly concentrated in spring. (4) The trend of annual total number of sand dust days decreased from 1860 A.D. to 1898 A.D., so as to the number of dust days in spring. (5) During 1860~1898 A.D., there were 23 sand dust weather processes that were lasting longer than one day, of which the longest one lasted 4 days. These finds may be helpful to study the impact of climate change on sand dust weather and to analyze evolvement regulation of sand dust weather in Beijing.