The time lag between the stem sap flow of Populus euphratica and environmental factors were analyzed based on the experimental data of sap flow and environmental factors from April to September, 2012. The results showed that, in different seasons and for different environmental factors,the time lag effect varied obviously.The sap flow velocity of P. euphratica from April to September was lagged behind 1 hours to Photosynthetic radiation, but advanced of 1 hour to air temperature, of 2 hours to relative humidity, of 2 hours to vapor pressure deficit. The correlation coefficient were 0.709、0.766、-0.804 and 0.81. Principal component analysis could be used to simplify the complexity. The time lags of both the first and the second principal components were 1 hour in advance of the sap flow of P. euphratica. The regression analysis showed that with time lag effect considered, model fitting precision would be improved.
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