Abstract: The article gives some theories about the relations among solution sets of logic equations  ｍｉ＝１（Ｆｉ＋Ｇ－ｉ）＝１，ｍｉ＝１　ＦｉＧ－ｉ＝１ and logic equational group Ｆ１＝Ｇ１，Ｆｍ＝Ｇｍ.The following conclusion is obtained:if solution set of  ｍｉ＝１（Ｆｉ＋Ｇ－ｉ）＝１and ｍｉ＝１　ＦｉＧ－ｉ＝１ are Ｓ１，Ｓ２　separately,thus solution set of logic equational group Ｆ１＝Ｇ2，Ｆｍ＝Ｇｍ is Ｓ１－Ｓ２.

Key words: logic equation, logic equational group, relation of solution set