Abstract: Some drilling software with Chinese owned intellectual property can only be used in aided design, not sufficient for decision-making by teams of experts. Some the software programs only focus on data transmission or early warning of certain risks. So those software applications are limited and fail to form a comprehensive decision-making information support system. Based on the expert decisionmaking needs in the design of drilling programs, the demonstration and drilling construction, the decision support system was developed based on function design and key technology research which were carried out. The drilling engineering decision support system, DrillAdviser, was developed based on SOA software architecture and plug-in development method. This system is easy to expand and it combines engineering geology information and drilling engineering information. It covers key technical elements of drilling engineering design, construction process optimization and post-drilling analysis. In addition, it can provide decision support such as real-time fusion of multi-source heterogeneous information, 2D and 3D graphic display, computational simulation and collaborative discussion for expert decision making. It preliminarily solves problems of reduced function and insufficient fusion of multi-disciplinary information in present drilling decision support software. According to the actual application in multiple regions within and outside the country, DrillAdviser proved itself to be of reasonable design with good results.