【正文】 Therefore, to achieve energy saving goals, we can improve the residential and mercial building equipment at the beginning. Although the government has controlled the power use of the new building, in Taiwan there are still more than 94% old buildings which did not consider the energysaving. This paper aims to succeed in that the advanced metering infrastructure optimizes load operation with power line carrier and achieves the load management. Two subsystems of the hardware are posed of a maser module and two control modules. The master module consists of a signal transform circuit, an AVR microprocessor, a keyboard decode circuit, a LCD circuit, and a power line carrier circuit, which has functions of local and remote monitoring . Control modules are classified into 2 categories air conditioning control module and illumination control module. Each control module consists of a signal transform circuit, an AVR microprocessor, a keyboard circuit, a LCD circuit, and a power line carrier circuit, which has the functions of manual and automatic load control. An infrared control circuit is installed in air conditioning control module for controlling air conditioner, and a power control circuit for controlling illumination device is added to the illumination control module. These modules realize munications via power lines . The distributed management is adopted to allocate information resources to every module. The distributed form is also applied to the information system development and data store. Its main advantage is that it can satisfy the information needs of each module and meet the demand that each module controls information resource. With convenience for use and maintenance, it has the biggest difference from centralization that if a module is down, other modules can still keep running and the overall system will not e to a standstill. The research result of this paper is estimated to be smoothly applied in the occasion that the load management is required to reduce electric charge .II. METHODOLOGY A. Load Management Plan This paper makes use of distributed control model to serve the purposes of humanity and load control. Depending on highly automatic operation, it will take proper actions according to realtime and accurate data to reduce labor cost and electricity expenditure, and improve power efficiency. This system includes a master module and multiple control modules, show as Fig. 1. The master module monitors the users’ practical electric power utilization, and transmits signal to control modules. The control modules will adopt certain control technologies to switch off the electricity or adjust the equipments’ power consumption in accordance with load characteristics. Considering that users know little about the service condition of electric power, this paper will develop a system that is suitable for ordinary people to operate and there will be a LCD screen for observing the service condition of electric power. Therefore, users can know their electric power quality or change the schedule of electric power utilization accordingly. The master module, a digital meter, is used to measure the parameters including the effective values of voltage and current, total power, total reactive power, etc. The module has external munication interface, which can transfer data via power line carrier, thus, wherever the control modules of the building are, once the LAN is connected, any load can be remotely monitored and controlled. Control modules are open, which receive service condition of electric power and properly controls the equipments. The working conditions of equipments are considered as judgments of control. Control modules can be divided into air conditioning control and illumination control on the basis of load characteristic. This paper controls large loads in family including air conditioners and lighting equipments. Air conditioner adopts infrared rays to exercise air conditioning control, while lighting equipments are for illumination control. With rapid development of technology, load control will be more pact and reliable。 whose hardware will plete a monitoring system in cooperation with automatic meter reading for munication technology is being more developed.B. Hardware System See Fig. 1 for hardware framework. The system of this plan includes 3 subsystems, namely master module, air conditioning control module and illumination control module. The master module can measure the realtime states, including the voltage, the current, the real power, and the reactive power, etc., which will be revealed on LCD screen. The measured data can be transmitted to control modules for further handling via power line, and the control modules can control loads based on the received data. The master module consists of a signal transform circuit, an AVR microprocessor, a keyboard decode circuit, a LCD circuit, and a power line carrier circuit. It has the functions of local and remote monitoring. The signal transform circuit can transform the actual values of voltage and current into the available voltage level in line with analogical/logical conversion. AVR microprocessor can take samples of continuous signals, process mands of keyboard and puter, output the result to LCD and mand the controller’s actions. The keyboard circuit mands AVR to display different parameters. The LCD circuit can reveal the measured wave and measurements and so on. The aim of power line carrier circuit is modulating the service condition of electric power to the power line carrier signal, which will be transmitted to control modules for controlling purpose. Air conditioning control module consists of a signal transform circuit, AVR microprocessor can process the mands of keyboard, generate control mands according to master module, output results to LCD and drive infrared rays control circuit. The keyboard circuit can mand AVR to reveal different parameters, or in