Abstract: ‘Huangguan 666’is a new tomato hybrid bred from‘L35BD’（high-quality，hard flat round fruit）בL50-3-1’（high-quality，bright-color and high hardness）. Its growth type is infinite. The bracts are flat，the handle is short-curved. The fruit is slightly flat and round，and the young fruit has no green shoulder. The single fruit weight is 140–160 g. The matured fruit is red，with high hardness，and the taste is sweet and sour. The fruit commodity rate is high. The cultivar has high resistance to bacterial leaf spot，leaf mold，blight and verticillium wilt，but the resistance to late blight and viral disease is medium. And it has strong cold resistance，moderate suffocation and drought tolerance. The fruit is resistant to cracking and is suitable for cultivation in the open field. The output is 75 000–97 500 kg ? hm-2.

Key words: tomato, red fruit, hard fruit, open field cultivation, cultivar