Seasonal chart analysis mostly adopts monthly fluctuation probability statistics, and the specific steps are as follows: ① determine the research period and select commodity futures price data; (2) Determine the research cycle. Researchers can determine the time span of the cycle according to the characteristics of the research goods, which can be weeks, months or quarters. , and select monthly here; ③ Calculate relevant indicators, such as the number and percentage of years of increase or decrease, the range of increase or decrease, etc. (4) Judging the seasonal variation of commodities according to the index.