Abstract: Well cementing operations in Block Shunnan has been encountering technical difficulties such as active oil and gas, severe gas cut, narrow density window, deep well, high bottom hole temperature, and low pressure bearing etc. To deal with these difficulties, a precise dynamic pressure control well cementing technology was applied in Shunnan, and well cementing was successfully performed. In applying this technology, the pressures at the wellhead and the bottom were carefully controlled to prevent lost circulation and well kick from occurring. The well cementing job was safely performed while the job quality was enhanced. This technology has been successfully applied in cementing the well Shunnan-6 and the well Shunnan-7. This technology is of great importance in cementing wells penetrating pressure-sensitive formations, and is worth applying widely.