The symbiotic application is designed to achieve the function of supporting a user based on the knowledge of social and perceptual interaction. The architecture of the symbiotic application was described at the ICCI'08. In this paper, we described the design of symbiotic base mechanism for the cognition functions and the decision functions in a symbiotic application. The symbiotic base mechanism converts the signals from the real space and the digital space to the awareness. The symbiotic base mechanism do the action on actuators based on the operation by the cognition functions and the decision functions. The cognition functions and the decision functions are achieved by the intelligent multi-agent system such as an OMAS and a ADIPS/DASH. On the other hand, the symbiotic base mechanism is constructed by a multi-agent system which is called by the Symbiotic Multi-Agent: SYMA. The example scenario is shown by the combination of multi-paradigm/multi-agent framework. Symbiotic Computing, Cognition Layer model, Awareness, Social-ware, Multi-agent systemI.