We present a review of our results on electron transport properties of thin film <$E roman {Au "/" YBa sub 2 Cu sub 3 O} sub x> and <$E roman {Nb "/" Au "/" YBa sub 2 Cu sub 3 O} sub x> heterojunctions. Second harmonic has been experimentally observed in superconducting currentphase relation of <$E roman {Nb "/" Au "/" YBa sub 2 Cu sub 3 O} sub x> heterojunctions on <$E c>-axis oxiented <$E roman {YBa sub 2 Cu sub 3 O} sub x> films. Phase and temperature dependence of the second harmonic can be explained in terms of combined symmetry <$E d sub {x sup 2 - y sup 2}~+~s> of superconducting order parameter in <$E roman {YBa sub 2 Cu sub 3 O} sub x>. Current-voltage curves of <$E roman {YBa sub 2 Cu sub 3 O} sub x> and <$E roman {Nb "/" Au "/" YBa sub 2 Cu sub 3 O} sub x> heterojunctions on thin (1 1 20)-oriented <$E roman {YBa sub 2 Cu sub 3 O} sub x> films with tilted <$E c>-axis show zero bias anomaly conductance peak studied in high magnetic fields and at different temperatures. Obtained experimental results have been analyzed within the model of bound states caused by multiple Andreev reflection in heterojunctions with <$E d sub {x sup 2 - y sup 2}~+~s>-wave superconductors. Thermal and shot noise contributions have been observed in <$E roman {Nb "/" Au "/" (1~1~20)YBa sub 2 Cu sub 3 O} sub x> heterojunctions at <$E T> = 4,2 K. However, no shot noise enhancement has been revealed in our experiments.

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