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With the continuous improvement of Global Navigation Satellite System (GNSS) and the rapid development of economy and society, people"s demand for indoor location services is becoming stronger and stronger, and the research on indoor high-precision positioning technology for smartphones is booming. In order to solve the problem of indoor positioning by receiving BeiDou pseudolites signals from commercial smartphones, we carry out data quality analysis of BeiDou indoor pseudolites observation data on smartphones, and analyse the performance of mobile phone GNSS chips in terms of data completeness, weekly hopping ratio, carrier-to-noise ratio, Doppler shift, carrier phase, etc., so as to provide data support for pseudolites positioning of smartphones in the indoor car park environment, and to provide data support for BeiDou indoor and outdoor integration. It provides data for pseudo-satellite positioning of smartphone in indoor car park environment, and provides reference for BeiDou indoor and outdoor integration. The study shows that in the underground car park environment, the data continuity and stability of the carrier-to-noise ratio and the interstellar carrier phase difference of some mobile phones can reach the level of dedicated measurement receivers in the stationary state, and the data quality of the interstellar data difference of some mobile phones in the walking state is even better than that of the measurement receivers.