Abstract: The effect of different film-uncovering time on yield, output value, inner chemical components and quality of fluecured tobacco in upland field was studied by the method of grey correlation analysis. The results indicated that 50d filmuncovering treat was the highest of all treatments. When the plants were taken off film at 50d after transplanting, their leaves yield and output value was highest, inner chemical components cohered and the quality was superior. The consequence corresponds to reality in filed.