Abstract: It is difficult to enter into the oil displacement and profile control wells located near villages. The lab research on a kind of online mixing oil displacement and profile control agent (GFS-1) and its matching technology are conducted to solve the problem. Experiment on the composition selection of the agent and its performance is also conducted by putting the cross linking agent into the main high-dispersion agent. According to the characteristics of GFS-1, the research on the online mixing technology of the agent is conducted. Results show that GFS-1 features in high dissolution rate, good compatibility with clean water and sewage, and good thermal stability. It gels in five hours, and the plugging rate is 59.4%. Devices for mixing and preserving fluid can be used to solve the difficulty in entering into the well site, because they are characterized by small size and flexibility, small occupying area, high security and reliability. 