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The equator day SST time series(ESST) and the nine points moving average month air temperature data of Qingdao(NMAMAT) are detected using the frequencies spectrum and the probability density of points in recon structed phase space.The results show that the hidden periods of other physical variables in ESST system and NMAMAT system are 23.3,10.5,7.7 d and 10.6,5.7,4.5,2.9 a,3 months,respectively.The physical variables of these hidden periods are guessed by experience in knowledge of these systems.