Abstract: Density,quantity of fertilizer dressing,ratio between intercropping crops,ways for calculation yield and total output in intercropping research were discussed in relation to the whole intercropping system and ecology theory,then conception of crude density,ecological density and standardization yield and total output were used to solve the problems in calculation of real area,whole area,yield and total output of intercropping crops in this paper,By combination of proportion of row with proportion of crops the spacing and population of intercropping crops can be described.