Abstract: The fracturing technology was developed application and study on difficult produced reserves in Dagang Oilfield. It includes formation rock mechanics research, fracturing technology optimized choice, fracturing material chosen and evaluated, fracturing treatment parameter optimized design and fracturing diagnosed and evaluation. Formation rock mechanics parameter was acquired. Two new fracturing technology of pumped twice ball disparted third pay zone fracturing and packer disparted fracturing and pumped ball disparted fracturing together was brought forward, fracturing material used to difficult produced reserves was chosen out, fracturing treatment parameter optimized design of experimentation well was conducted and executed.