To improve the living quality of the elderly, the research on comprehensive indoor monitoring system for daily activities is of great importance. Some emergencies in the daily life of the elderly, including tumbling or falling off the bed, are difficult to be found and handled in time. This consequently delays the time for treatment. This study presents that based on ZigBee network, a new indoor monitoring system consists of two parts: the bed-exit detection and the toilet alarm subsystem. The bed-exit detection subsystem can detect whether the elderly is in the bed or starts to count time when the elderly totally gets up and leaves the bed. The toilet alarm subsystem can keep recording the time that elderly people stay in the room. If the suspected statuses are observed, the monitoring system will signal an alert warning to the caregivers who can check the real condition of the elderly people and help them get out of the trouble in time. Experiments were conducted and the results could illustrate the effectiveness and instantaneity of this system.