The logistics support of large units can not be separated from the process management information system at any time. The traditional methods adopt the fixed flow diagrams and the fixed forms, which can not meet the requirements of flexible and independent logistics management under the new situation. At the same time, the relational database mode adopted by traditional information systems is also difficult to adapt to the current big data in logistics support. This study designs and implements a logistics free process information system using Activiti and MongoDB. With the goal of free and flexible process management and the idea of relational database assisting non-relational database as design concept, the free process framework, key interfaces and important code logic are given, as well as the design method of two kinds of database collaboration. The implemented system effectively solves the above problems, greatly reduces the workload of developers, and provides an effective system design reference for logistics support process management informatization of large enterprises or units.