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Antenna configuration is one of the important factors that affect the attitude accuracy in GNSS attitude determination system.Antenna configuration of GNSS attitude determination system can influence the accuracy of that.To study the influence,the algorithm of GNSS attitude determination is analysed.Based on the analysis,the relationship between antenna number,baseline angle,baseline length which determine the antenna configuration and attitude angle error is deduced in theory.A simulation is made to analyse the influence degree of antenna number,baseline angle and baseline length to the attitude angle error. Theoretical derivation shows that attitude determination need at least three stationary antennas, attitude angle error is smallest when two baselines are perpendicular, attitude angle error is inversely proportional to the square of the baseline length.Simulation confirms conclusions above and shows more that ,when baseline length is 1 m, 2 m and 3 m respectively,the error of heading and roll angles is under 2,1 and 0.5 degree,the error of pitch angle is under 3,2 and 1degree.