原QB的大概意思如下: DIM Sum AS LONG M$ = ">" + HEX$(Address%) + "F" + "05" //其中Address%=254 FOR i% = 2 TO LEN(M$) Sum = Sum + ASC(MID$(M$,i%,1)) 当前在300中可以在DB0中定义如下: +0.0 WORD 16#3E //即 ">" +2.0 WORD 16#FE //即 254 +4.0 WORD 16#F +6.0 WORD 16#5 那应该怎样求Sum? 请指教!~