With the development of IoT (Internet of Things), the number of communication devices will grow rapidly, which leads to a higher requirement for devices’ power consumption. Thus, Zigbee backscatter is a promising research direction, as Zigbee devices are ultra-low power, and the power can be further reduced by utilizing backscatter technique. Considering the need for the research on Zigbee backscatter and widespread ambient BLE (Bluetooth Low Energy) signals, we proposed an inter-technology backscatter system in which the tag can create Zigbee-compatible signals over ambient BLE carriers. Previous similar backscatter systems used BLE single-tone carriers, which are generated by setting BLE packets to specific values. Compared with them, our backscatter tag can utilize widespread ambient BLE signals as carriers and is much easier to widely deploy. In addition, by using BLE extended advertising packets as carriers, we significantly improved the goodput. Besides these, we constructed a reverse data path from the Zigbee device to the tag by utilizing the BLE carrier provider as a relay, which enables the Zigbee receiver to communicate to the BLE excitation and the tag at the same time. We have done some experiments and have successfully verified the feasibility of the system. The experimental results show that our system has a comparable BER (bit error rate) to the systems that used single-tone carriers and can achieve a goodput of up to 23.2 kbps.