Multi-channel technology can eff ectively eliminate wireless interference. The algorithms proposed for multi-channel sensor networks usually assume that there are enough channels available to enable interference-free parallel transmission. However, in practice, the channels that can be used are limited. This makes it possible that wireless interference cannot be completely eliminated, making parallel transmission impossible. Therefore, it is a challenging problem to develop a scheduling algorithm with fully parallel transmission capability under limited channels. To solve this problem, this paper proposes a heuristic slot reuse algorithm combining Signal to Interference plus Noise Ratio (SINR) and multi-channel technology. The algorithm allocates consecutive slots to nodes in a top-down manner. When the slot cannot be allocated because the SINR is not satisfi ed, a new channel will be added and allocate the slot. The simulation results show that our algorithm achieves concurrent transmission under limited channels, resulting in an optimized scheduling length.