AWS Config Bucket Policy是AWS服务中用来定义对于存储AWS Config记录的S3存储桶的网络策略的一种语言。以下是定义允许AWS Config服务访问您的S3存储桶的默认政策：

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "AWSConfigBucketPermissionsCheck",
            "Effect": "Allow",
            "Principal": {
                "Service": "config.amazonaws.com"
            },
            "Action": "s3:GetBucketAcl",
            "Resource": "arn:aws:s3:::examplebucket"
        },
        {
            "Sid": " AWSConfigBucketDelivery",
            "Effect": "Allow",
            "Principal": {
                "Service": "config.amazonaws.com"
            },
            "Action": [
                "s3:PutObject",
                "s3:GetObject",
                "s3:ListBucket"
            ],
            "Resource": [
                "arn:aws:s3:::examplebucket/AWSLogs/account-id/*",
                "arn:aws:s3:::examplebucket/config/*"
            ],
            "Condition": {
                "StringEquals": {
                    "s3:x-amz-acl": "bucket-owner-full-control"
                }
            }
        }
    ]
}

其中包括了两条语句，第一条用来检查AWS Config服务是否有访问您的S3存储桶权限的语句，第二条用来允许AWS Config服务向存储桶上传和读取记录文件。

如果您需要更改此政策，可以通过AWS控制台或AWS CLI进行更改。需要注意的是，任何更改都可能影响到您的AWS Config服务，并需要特别谨慎。