The potential energy curves of some heteronuclear diatomic molecules are studies using the energy consistent method (ECM) for the electronic states of Clf-A３Π1, ClF-B0＋(３Π)，CH-X２Π，BH-X1Σ＋，XeO-d1Σ＋，LaF-X1Σ＋，Li7D-X1Σ＋，NaRb-X1Σ＋，KRb-(2)3Σ＋ and KRb-21Π. The results show that the ECM potentials are in excellent agreement with the known Rydberg-Klein-Ress(RKR) data, and are superior to the frequently used Morse potential and Huxley-Murrell-Sorbie(HMS) potential. The EGM potential can give reliable potential data at the molecular asymptote and the dissociation region where the RKR results may not be available.