Abstract: To study the suitable climate resources of cabbage mustard growth in Guizhou, based on the daily air temperature and precipitation data of 84 national meteorological observation stations in Guizhou from 1981 to 2010, and combining with the biological characteristics of cabbage mustard, we established the temperature, precipitation and climate suitability models according to the theory of agro-ecological climate suitability and fuzzy mathematics method, and evaluated the climate suitability of cabbage mustard growth with gradual pentad by this model. The results showed that: the relatively appropriate, suitable and most suitable period of growth temperature of cabbage mustard in Guizhou focused on the 1st pentad in March to the 5th pentad in November, and the most suitable period was concentrated in April’s 4th pentad to the October’s 3rd pentad; while the relatively appropriate, suitable and most suitable period of cabbage mustard precipitation focused on the 5th pentad in March to the 5th pentad in May, the 3rd pentad in July to the 4th pentad in November, but the most suitable period of precipitation was relatively short, only in the 3rd and 6th pentad in October. When the temperature is the dominant factor, the precipitation has a significant effect on the climatic suitability of cabbage mustard. The most suitable climatic period for the growth of cabbage mustard in Guizhou is from April to May in spring and from September to October in autumn, and the climatic condition in autumn is better than that in spring, which can meet the normal growth of cabbage mustard in the open field for 2-4 cropping.