The conditional probability PA in internal finitely additive probability space (X ,ζ,P) is defined ,and the conditional Loeb probability space ( X ,L(ζ,PA ) ,L( PA ) ) is derived by completion .T hen the Loeb space ( X , L(ζ,P) ,LP ) is derived by completion of internal finitely additive probability space (X ,ζ,P) ,and the conditional probability LP(A) in Loeb space (X ,L(ζ,P) ,LP ) is defined .By dicussing the relationship of these two spaces ,it is proved that L(ζ,PA)= L(ζ,P) ,and for ∀B∈ L(ζ,P) ,L(PA)(B)= LP(A)(B) .%给出了内有限可加概率空间( X ,ζ,P)上条件概率 PA 的定义,并通过完备化得到条件Loeb概率空间(X ,L(ζ,PA),L(PA))。其次对内有限可加概率空间(X ,ζ,P)完备化,得 Loeb空间(X ,L(ζ,P),LP)。在所得Loeb空间上定义Loeb条件概率LP(A),并讨论这2个空间之间的关系,得出L(ζ,PA)= L(ζ,P),且对∀B∈ L(ζ,P),L(PA)(B)= LP(A)(B)。
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