Let F = Q(d) be a real quadratic field and ε = x + y d the fundamental unit of F satisfying N F/Q (ε) = 1 .Some connections between the ramification properties for dyadic prime ideals in quadratic extension F( ε)/F and congruence properties of x ,y were established .As a corollary ,some congruence properties about x , y were given when d = p1 … pr or 2 p1 … p r with p1 ≡ … ≡ pr ≡ 1 mod 4 being distinct prime numbers .%设 F＝ Q（ d）为实二次域，ε＝ x ＋ y d为 F 的基本单位，并且ε满足 N F／Q （ε）＝1．建立起二次扩张F（ε）／F的二进素理想的分歧性质和 x ，y 的同余性质之间的联系．并在 d ＝ p1… pr 或2 p1… pr 的情形下，给出 x ，y 的一些同余性质，其中，p1，…，pr 为模4余1的不同素数．
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