distribution. 4)The P-norm distribution entropy simplified method was investigated. It is considered that the probability density function complexity of P-norm distribution is not conducive to the entropy calculation and practical application.The P-norm distribution entropy can be expressed by combination of simple distribution entropy approximately,simplified the calculation process. 5)The GPS RTK error of observation data is analyzed by using entropy method,and an effective means for surveying data error analysis based on entropy has been constructed. 6)An estimation method of contamination rate based on entropy was proposed.It is useful for gross error statistic to avoid limited error selection.Two models of data main distribution were suggested to investigate contamination rate and the estimation methods of contamination rate based on entropy were given out.A numerical simulation was performed to analyze the influence of entropy truncation error on data contamination rate estimation.It is less influence for entropy truncation error to contamination rate estimation based on entropy. Keywords:entropy,entropy coefficience,uncertainty,contaminated normal distribution,P-norm distribution Classification:528.1 万方数据distrlbution． 4)The P—norm distribution entropy simplified method was investigated． It is considered that the probability density function complexity of P—norm distribution is not conducive to the entropy calculation and practical application．The P—norm distribution entropy can be expressed by combination of simple distribution entropy approximately,simplified the calculation process． 5)The GPS RTK error of observation data i s analyzed by using entropy method，and an effective means for surveying data error analysis based on entropy has been constructed． 6)An estimation method of contamination rate based on entropy was proposed．It is useful for gross error statistic to avoid limited error selection．Two models of data main distribution were suggested to investigate contamination rate and the estimation methods of contamination rate based on entropy were given out．A numerical simulmion was performed to analyze the influence of entropy truncation error on data contamination rate estimation．It iS 1ess influence for entropy truncation error to contamination rate estimation based on entropV． Keywords：entropy，entropy coefficience，uncertainty，contaminated normal distribution，P—norm distribution Classification：528．1 V 万方数据