To permanently keep and efficiently use data implied in curve on well-logging paramete graph are becoming very important in petroleum industry. In this paper, we contribute a system based on multi-agent technology to digitize well-logging curves and store the data into Oracle database by means of agent-based database broker. We employed some ideas of Gaia and Open Agent Architecture (OAA) to analyze and design the system. We applied Line Adjacency Graph (LAG) data structure to develop the image-compressing agent, which compresses image files with great efficiency. According to the characteristics of well-logging paramete graph, the digitizing algorithms based on centimeter grid of coordinates, which perfectly rectify the distortion of paramete graph, are proposed for implementing the digitizing agent. We applied middleware agents to operate databases in uniform database-based agent communication language (DBACL). The experimental results show that all agents in the system can work cooperatively.