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The gray correlation analysis approach is employed to analyze the effect of number of pipe rows,the air circulation rate and the air temperature on efficiency of wood drying in solar drying system with phase change thermal storage,the relative order of influencing factors on wood drying process is determined.It indicated that air temperature is the 1st key influencing factor in the in solar drying system,followed by the air circulation rate,and then the number of tube rows.This result is of practical significance for the optimization of the drying process.