This paper is about a research on hop routing tree protocols in a large wireless sensors network. We propose a balance convergecast tree algorithm (BCT) based on heuristic algorithm. The BCT combined with channel multiplexing can be used to save time efficiently on collecting data. It can help decrease the degree of data accumulation, save data collecting time and delay the time of the network interruption. This method includes a channel allocation system for raising degree of transmission node synchronization that can enable node to combine and allocate communication channels to transmit data with the shortest communication timeslot and limited code. The use of BCT can improve the level of synchronous transmission and accelerate the material collecting speed on network by saving material pausing time on node. The simulation results show that the use of BCT can collect data more rapidly and also prolong system's lifetime, meanwhile prove that the load balancing tree can greatly enhance the convergecast tree working efficiency for collecting data.