An advanced architecture of learning system with flexible, mobile and joyful features for supporting ubiquitous learning is developed in this research. The architecture consists of five hardware key elements and a supporting information system to form a brand-new ubiquitous learning system. We call the designed and developed system as Ubiquitous Open-structured Neo-tech Edutainment (or u-ONE System for short) which includes learning robot, sensing input device, mobile computing device, mobile output device, wireless local network and u-ONE Software. The design and development of u-ONE System is guided by experiential learning theory, constructivism learning theory, and joyful learning element. Instruction, collaboration learning and self-learning of application modes are supported by u-ONE Software for realizing ubiquitous learning. The aim of this research is to design and develop a prototype of u-ONE System includes hardware and software components for supporting children¡¦s learning by using robot and RFID. Instructor and learners can meet at any place with their own gears to form a u-ONE System and start instruction and/or learning activities. Only instructors need to operate the control station for coordination; learners just intuitively interact with learning robot by a natural and person-to-person-liked interaction method. In u-ONE System, learners do not need to have good information technologies literacy such as the keyboarding skills which are especially crucial for the earlier childhood learners. Besides, many parents and educators are concerned of watching computer screen for a long time that may harm children¡¦s eyesight; u-ONE System provides an alternative solution for this. This research¡¦s experiment result found most learners could arouse their learning motivations and help them concentrate on learning activities. The class order is also improved for instructors more easily to control the behaviors of learners during the class.