Based on the principle of quantum coherence and quantum spatial positioning, the experimental scheme of the quantum spatial positioning is designed. The spectrum characteristics of the entanglement photons with spontaneous type-II parametric down-conversion pumped by a broadband frequency pulse laser are discussed. The characteristics of the second-order coherent function and the impact of the phase matching conditions on the quantum spatial positioning are analyzed. It is shown that awith the increase of the pump band-width, the coherence of entangled biphoton is diminished, and the measuring accuracy of the quantum spatial positioning is also reduced.