Abstract: The “four low” characteristics-low permeability, low pressure, low abundance and low productivity , has made the fracturing as a necessary way of high productivity in Block Su75 in Sulige gas field. Aimed at the first horizontal well-Well Su75-70-6H in Block 75 in Huabei Oilfield, staged fracturing with open hole packer technology was proposed and 10 stage fracturing treatment with 406 cube meters sand using a low damage carboxymethyl fracture fluid were operated successful which made many technical indexes rank first in the whole country. At present, this well choke and back flow smoothly and the primary test of open-flow potential is 1.53 million cube meters per day, which all illustrate the great effect of fracturing. This case marks the breakthrough of horizontal well production technology, and accumulates precise experiences for following deep application of various new technologies.