Abstract: For providing technical director for large area demonstration and popularization of Mingtang86-2121，we studied on character of Mingtang 86-2121 during the contrasting test to prepare regional trial and regional trial of new sugarcane variety in Fujian province ， The investigative results were as follows: The germination was 61.32%, decrease by 5.90% in comparison with the variety of Mingtang70-611. The tilling rate was 134.97%, plant height was 305cm, stalk diameter was 2.621cm, millable stalks was 73374 stalk/hm2,mean cane yield was 117.581 t/hm2, sucrose content was 14.40 during the period of Nov. to Feb, sugar yield was 117.58t/hm2, increased by 44.21%, 6cm, 0.078cm, 11479 stalk/hm2, 28.06%, 0.19% and 29.85% in comparison with Mingtang 70-611, respectively. Mingtang 86-2121 had characters of middle to late maturity ,high and stable in cane yield, wide adaptability, strongly resistance to mosaic、smut、red rot、pokkah boeng、rust and drought. The analysis of hereditary compose in Mingtang86-2121 showed that it was abundant in hereditary, which content 14 different basic germplasm.