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Optical clocks with accuracy and stabilityachieve to 10-18 level currently.The paper presents the progress on the optical lattice clock of Sr(Strontium)atoms at NTSC(National Time Service Center).88 Sr,one of four isotopes of Sr with the highest natural abundance are cooled on the basis of transitions(5s5s)1 S0-(5 s5p)1 P1 and(5 s5s)1 S0-(5 s5p)3 P1 in order.