Through a nalysing the relatio nship betw een epidemical tendency of soy bean frog eyeleaf spo t and the rela tiv e meteo ro logical informa tio n f rom 1981- 1994 in Jiamusi regio n,Heilong jiang province, by using facto rial analysis and stepw ise reg ression, the primarymathematic models of fo recast fo r epidemical tendency o f so ybean f ro geye leaf spot fo rnonpa rticular calamity year w ere established. Thei r histo rical fi tness are 92. 9% - 100%respectiv ely. By analysing the data of yield loss and di sease, the result show ed thatthere w ere posi tiv e linear correlatio ns, betw een yield loss of so ybean wi th disease sev erityof leaf, po t , and g rains in cultiva rs bo th resista nt and susceptible.