∑‘Zhengfan 1203’ is a new tomato F1 hybrid of late-maturity and infinite-growth-type，developed by crossing‘ T12-6’as female parent and‘ TY12-3’as male parent．This variety has good commercial character and low split rate．Its leaf is dark green in color．It has strong growth vigor．The fruit is pink in color．The young fruit has no green shoulder．The fruit is tall and round shape with smooth surface and high hardness．The average single fruit weight is 198 g．This variety contains Ty1，Ty3a and Cf9 genes．It is resistant to Tomato yellow leaf curl virus（TYLCV） and leaf mold in fields．Its VC content is 155.4 mg·kg-1 and soluble solid content is 4.2%．The yields of early spring and late autumn cultivation were about 93.0 t·hm-2 and 61.5 t·hm-2，respectively．It is suitable for cultivation in protected fields in spring and autumn in northern China．