Based on the theory of fluvial sedimentology, high resolution sequence stratigraphy, and hydrogenic uranium metallogenesis, together with the core and logging data, the braided river faces were disscussed in detail that of upper member of Saihan Formation of Lower Cretaceous(K1s2). Analysis of vertical and horizontal distribution and genetic feature of braided river sandstone controlled by the base level cycle was made. It was concluded on braided river sandstone ore-bearing law of Bayanwula uranium deposit. Furthermore, the point bar ore-bearing model was build. Consequently, ore body was mainly in the point bar sandstone, which was formed under low capacity space condation, and in the meeting of braided river and point bar in Bayanwula uranium deposit. It was significant for perphery prospecting in Bayanwula deposit and paleo-valley type uranium prospecting in other area.