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Spacial-time division multiple access (STDMA) in wireless multi-hop networksis studied. Different from most of work that adopt the protocol interference model which merely take consideration of packet collisions, our proposed algorithm uses the physical interference model to reflect the aggregated signal to interference and noise ratio, which is a more accurate abstraction of the real scenario. However, the model is notoriously hard to solve. We propose a novel scheduling method based on the Integer Linear Programming (ILP) and resolve it by an approximate solution based on a randomized rounding method. The performance analysis and simulation results show that significant improvements on the throughput of the network could be achieved.