Currently,the BeiDou Navigation Satellite System(BDS) lacks detailed strategic references for achieving high-precision data solutions in large-scale regional networks. This study systematically examines four key factors influencing high-precision BDS data solutions,using observational data from the China Seismological Experiment Site. These factors include positioning performance,the quality of observational data,the orbital accuracy of various precise ephemerides,and baseline solution parameters. The findings are as follows: ①Positioning Performance:The positioning capabilities of the BDS constellation,comprising BDS-2 and BDS-3 satellites,are comparable to those of GPS,with BDS exhibiting superior stability. Notably,BDS-2 satellite observational data demonstrate higher quality. Incorporating BDS-2 data when processing BDS-3 observations enhances solution accuracy. ②Observation Frequencies:Among BDS-3 observation frequencies,B1C exhibits a relatively low signal-to-noise ratio,while B2a is prone to significant pseudorange multipath errors. Consequently, B1I and B3I are recommended for high-precision double-differencing positioning solutions. ③Precise Ephemerides:The orbital fitting accuracy of Medium Earth Orbit(MEO) satellites in the precise ephemerides provided by CODE surpasses that of WHU ephemerides and is comparable to GPS. Therefore,CODE ephemerides are recommended for high-precision BDS data solutions. ④Processing Strategy:When processing BDS observational data from the China Seismological Experiment Site using GAMIT10.71,the following strategies are recommended to achieve optimal resolution accuracy:(i) select RELAX as the experimental mode,(ii) use LC_AUTCLN as the observable type,and (iii) set the elevation cutoff angle to 10°. This study provides scientific guidance for processing BDS observational data in large-scale regional networks,offering practical strategies to enhance the accuracy of high-precision data solutions at the China Seismological Experiment Site.