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Abstract. Network Scalability is an important step in the development of UWB indoor localization system. Owing to its fine resolution and robustness in cluttered environments, UWB signals are well suited for localization purposes as they allow high ranging accuracy. T DOA algorithm based on UWB indoor localization system can achieve highprecision positioning but it requires each anchor clock synchronization. This paper mainly studied the optional of master anchor based on T DOA algorithm. It becomes an effective way to adapt to the complex communication environment. T hen realized the network scalability in multiple anchor conditions and finally evaluated the performance of master anchor optional algorithm on a realistic indoor scenario. A localization error analysis on UWB indoor positioning system was performed. The smallest T DOA measurement error is 15.127 cm and the worst error is 27.230 cm, as was shown by the test results.