Abstract:Climate change not only affect the growth of trees but also lead the relationship changing between the growth and climate,many studies had focus on the growth-climate relationship divergence phenomena,while standardization methods also effect this relationship.So to understand the influence of standardization methods on the divergence phenomena in different distributed altitudes,we tested the relationship stability of growth-climate by comparing relationship between the climate and the tree-ring width chronologies in two paired of Picea crassifolia in different elevations by different bootstrap cubic spline detrending methods.(1)With the raising elevation,limited climate factor of P.crassiifolia radial growth shifts from moisture to thermals.(2)At the altitude of 2 700 m,relationship between the radial growth and mean temperature of last December had undergone differentiation,standard chronology fitted by short bootstrap spline retained more precipitation signals;at altitude of 3 000 m,positive correlation of radial growth with mean temperature and precipitation in September of previous year was becoming more significant;at the altitude of 3 300 m,positive correlation between radial growth and precipitation of current Summer in the latter period was no longer significantly,while positive correlation between radial growth and temperature of current Spring and Summer was obviously changed.The short bootstrap spline detreding method highlighted the precipitation signal in 2 700 m,while the long bootstrap highlighted the temperature signals in 3 300 m.All the results indicated that divergence phenomena were effect by the climate signals in the chronologies which was heavily depending on the detrending methods.That suggested it was necessary to choose a suitable spline bootstrap in growth divergence phenomenon studies.