The invention provides a band dynamic selecting and time scheduling method in a heterogeneous network, relating to a method and equipment for dynamically selecting usable frequency resources in a plurality of main system bands in a heterogeneous network system based on the cognitive technology, in particular to a method and equipment used for opportunity spectrum access, frequency resource efficient utilization, and combination of heterogeneous network resource amalgamation and user business service quality (QoS) assurance. The invention has the band dynamic selecting method as follows: firstly, aiming to different main system characteristics, an average main system user detection threshold of each main system of a base station CBS accessory is defined and cognized, and the threshold is an average value of the prior detection threshold in a wireless network transmission environment; secondly, according to the average main system user detection threshold and the throughput needs of a secondary system user, scanning efficient time of CBS to each main system is defined; thirdly, the CBS selects the optimal main system band from a usable band list according to a request of a user, the wireless transmission characteristics and a channel state of a band channel are the basis for selecting the optimal band, and interruption of the equipment CPE transmission throughput is preset according to the user.