In this paper,the mathematical description of these techniques involves all estimation of parameters such as median,pseudo-standard deviation,weighted mean,weighted standard deviation.Their statistical estimation performances such as consistency,unbiasedness and validity are assessed.The results show that these order statistics are consistent and unbiased.The validity is under the traditional statistics for normal distribution,nears or exceeds for skewed distribution.The validity of weighted mean and weighted standard deviation exceeds median and pseudo-standard deviation,and is close to traditional statistics.The simulation and example both prove that order statistics are suprior as compared with the traditional statistics when outliers are presented in data.