400,000 CCB points can be exchanged for a variety of rewards or discounts. Here are some possible options:

1. Redemption annual fee: If you hold a high-end credit card from CCB, For example, if you have CCB Dashanbai (exclusive platinum card), you can use 400,000 points to redeem the card’s annual fee of 1,800 yuan. This is a common way to use points, which can effectively save the cost of holding a credit card.

2. Redeem gifts: Log in to the CCB credit card website and click "Points Redemption" to view various redeemable gifts, including electronic products, household items, kitchen supplies, etc. However, it should be noted that the type and quantity of gifts may be limited, and the points required for redemption may also be different.

3. Redeem air miles: Some China Construction Bank credit card points can also be redeemed for air miles, which may be a good choice for users who often need to fly. However, it should be noted that not all China Construction Bank credit cards support the redemption of points for air miles, and the redemption ratio and rules may also be different.

4. Redeem cash: In some specific activities, China Construction Bank may provide the option of redeeming points for cash. This is usually achieved by redeeming electronic coupons or vouchers of specified denominations, which users can use to make purchases at designated merchants or platforms. However, it should be noted that this redemption method may not be common, and the redemption ratio and rules may also be restricted.