In order to study the increasing law of early-age strength in the concrete-filled steel tube columns，a kind of early-age strength monitoring method based on the embedded piezoelectric transducers was put forward on the basis of existing concrete early strength monitoring technology. One concrete filled steel tube column specimen was designed and manufactured. Some smart aggregates for transmitting and receiving signals were pre-buried in concrete-filled steel tube columns as sensor and actuator. The collected signal data from sensors in the process of concrete early-age strength growing were analyzed. The experimental study show that the amplitude of voltage response decreases with development of concrete early strength. The concrete early-age strength increases at a rapid rate in the first week and a slowly rate after the first week. It reaches the peak value after 28 days. Correspondingly, the voltage amplitude drops quickly during the first week and then decreases slowly with hardening of concrete, the variation curves of voltage amplitude matches the curves of concrete early strength. The proposed piezoelectricbased smart aggregate monitoring method can be used to monitor the development process of concrete early strength effectively. The results can provide reference for engineering practice.