Abstract: The constitutions of panicle, grain and grain weight of intersubspecific hybrid rice as single cropping late rice in different yield levels were used to make correlation analysis, multiple regression analysis and path analysis between yield traits and yield. Then the high-yielding and high-resulting cultural techniques were promoted as follows: based on certain number of effective panicle number, seed setting rate should be improved and large panicles should be put emphasis on, at the same time, grain weight should be taken into consideration.