Abstarct: With the development of science and technology in recent years, a new branch of communication name molecular communication is proposed in electrical conferences. Molecular communication is not a simple development traditional network, but this type of communication is a sample completely new communication, which many communication processes are designed to imitate biological systems found in nature. Molecular communication networks are collection of nano-machines connected that through publish and share information new applications that by current technology is not possible proposed. Among the several methods of communication between the nano-machines that have been proposed, using a moleculs reason of very high proportion with dimensions and the environment is the best possible option. Communication molecule is a new interdisciplinary field of information and communication technology, biotechnology and nanotechnology, that data are sent and received through the molecules. Due to the many difference of traditional communication and molecular communication, many aspects of communication such as routing, coding, send and receive data, issues related to noise and security have not been studied properly in this type of communication and there is still a lot of work remains. The molecule is used to communicate in molecular communication. These systems need energy to produce and distribute molecules in the environment. Since nano systems have small dimention and energy storage, it’s expected that transmitters produce and store energy. Transmitters use part of produced energy for usual activities and the rest is stored. Energy consumption should not be more than produced energy. Therefor energy consumption is very important. In this research we investigate the capacity in the channels with variable distance between source and reciever. Finally we show that achiving to maximum capacity is available by allocating appropriate power and eliminating the memory effect. Also the results show it’s better to allocate more power in entervals with less distance and favorable condition to have succesful communication.