$Q_{tr\tau m}^{\left(m\right)}$

The number of preassigned demand period $\tau$ by the assembly plant for r level customers in t session in the instruction component m

${C^{\prime }}_{tr\tau }$

The quantity of the demand period $\tau$ preassigned by the assembly plant for r level customers in t time period is the capacity of production

$Q_{tlr\tau p}^{\left(p\right)}$

In t time period, the assembly plant preassigned the number of product p for r level customers in l area in the demand period $\tau$

$y_{tms}^{\left(m\right)}$

Variable 0-1, indicating whether to purchase components from supplier s of component m in time period t, if it equals to 1,then purchase,else not purchase