Based on the basic principle of wavelet analysis

multiresolution analysis of signal in atomic clock is made.The coefficients of wavelet transform for synthesis atomic time

which are weighed and averaged at different wavelet scales

are obtained.Then according to reconstruction theorem

multiresolution synthesis time scale can be reconstructed.Since the signal of atomic clock has been analysed by multiresolution

we can use wavelet variance at different scales to weight and average the coefficients.Thus either the difference in stability of different clock or the varying characteristic of the same clock at the different scale are all considered.Finaly

this method is checked by the measured data from National Timing Serve Center of Shaanxi Astronomy Observatory.It confirmed that this technique

which is simple and practicable

is a new method of multiresolution.From this method

the common characteristic of different clocks can be extracted.The stability of multiresolution synthesis atomic time scale is obviously superior to that of other methods.