Abstract: The low permeability tight sandstone gas layers of Sulige Gas Field are characterized by multilayer, long-gas-bearing interval, poor-physical property and so on. To increase gas production of gas layer, the technology of using packer separate layer fracturing is being widely used in Sulige. However, there is a ball in the tube after fracturing which is blocking the tube for traditional separated layer fracturing string, it is not conducive to test gas production profile and do downhole operation. Moreover, the oil tube is difficult to pick up and the anchors on the tube are too much in the later fracturing. in view of the question above, there are detailed introduction about Two-Layer Separate Layer Fracturing Commingled Unhindered Frac-string and auxiliary tools in this article, which can achieve two layer separated fracturing, unblock production in the tube after fracturing, provide convenient for tripping in test-tools and recognizing separate reservoir.