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We theoretically introduce the statistical uncertainty of photon number and phase error to discuss the precision of parameters to be measured based on weak measurements.When the photon counting scheme is used,we discuss the relative accuracy of the system in the presence of phase error by using the orthogonal and nonorthogonal pre-and post-selected states,respectively.When using the measurement scheme of pointer shift,we discuss the measurement accuracy in the presence of phase error,pointer resolution,and statistical uncertainty.These results give a guide way to get the smallest relative precision and deepen our understanding about weak measurement.