Two-photon laser-induced fluorescence spectrum (TP-LIF) of NO is obtained with a Nd:YAG pumped optical parametric generator and amplifier as radiation source. Spectral intensity distribution shows that the electronic transition moment for NO (A^(2)∑ → X^(2)∏) transition varies significantly with inter-nuclear distance. The variation relationship of the electronic transition moment versus inter-nuclear distance is deduced with polyminal fit procedure. The spontaneous radiative coefficients for NO (A^(2)∑ → X^(2)∏) transition from ν' = 0, 1 are obtained by combing this transition moment variation with the measurements of spontaneous radiative lifetime.