Compulsive settlement of exchange is to show income of all foreign currency must sell foreign currency nominated bank , do not allow to preserve foreign currency ; apiration settlement of exchange is to show foreign currency income can sell foreign currency nominated bank , also can open reservation of foreign currency account , settlement of exchange by foreign currency income possessory oneself decide ; limitation settlement of exchange is to show foreign currency income is inside the amount of national check and ratify but not settlement of exchange , exceed limit must sell foreign currency nominated bank 强制结汇是指所有外汇收入必须卖给外汇指定银行，不答应保留外汇；意愿结汇是指外汇收入可以卖给外汇指定银行，也可以开立外汇账户保留，结汇与否由外汇收入所有者自己决定；限额结汇是指外汇收入在国家核定的数额内可不结汇，超过限额的必须卖给外汇指定银行。
