The Santanghu Basin, being part of the northern Xingjiang province, was in the state of relaxant and collapsing tectonic environments after integral collision in the late Carboniferous, and most of the volcanic rocks are basic. It suffered compression from other plates at the end of late Carboniferous and was exposed to weathering and erosion. Weathering and fracturing alteration made the Paleozoic volcanic rocks become favorable reservoirs and rocks did not suffered these processes are unfavorable. Physical properties of various volcanic rocks enlarged and become favorable reservoirs after weathering and erosion. These spaces of the reservoirs mainly are secondary dissolution pores and fractures exhibiting a feature of double peak. The five layered structure is established for the volcanic erosion integrate, and indenting methods are brought forward. Different types of porosities and rock structures in various layers of the erosion are different. The corrosion zone and disintegrate zone are more favorable in the five, and the thickness of the whole erosion can reach 380m by far. And when the erosion controlled by faults with low angle fractures, it will become more favorable and thicker. The erosion mostly occurred at high place of paleo-geomorphology and slope, and along with the fault it developed better. These studies changed the concept that the Paleozoic volcanic rocks are not profitable for it’s strongly diagenesis and poor reservoirs, enlarging the exploration realm for oil and gas and will be important scientific significance for volcanic erosion exploration. Finally, weathering volcanic rocks existing in the Paleozoic strata in the western and central basins of China, and this will be a new petroleum exploration prospect for the future.