As a component of Digital Agriculture, farm field data collection and transmission are playing important roles. At first, this paper describes the status quo of farm field data collection and transmission. Secondly, to enhance the speed and flexibility and reduce the expense, a new farm field data collection and transmission system is introduced based on the Java phone, which adopts B/S web frame. In the frame, the system includes three parts: Mobile Client, Application Server and Database. Thirdly, the design of this system is analyzed in details. There are such functions on the mobile client as field data collection, data transmission, information query, location and navigation. Application server includes the data receiving, data storage, information query, and map service. Finally, a test prototype system was realized and discussed. The test results show that the field data collection and transmission system based on Java phone has good transplantation, improves the speed of data collection and transmission and saves expense.