Find the greatest positive integer $A$ with the following property: For every permutation of $\{1001,1002,...,2000\}$ , the sum of some ten consecutive terms is great than or equal to $A$.
1. **Sum of the first 10 consecutive terms in the sequence $\{1001, 1002, \ldots, 2000\}$:**

   We need to find the sum of the first 10 terms in the sequence:
   \[
   1001 + 1002 + 1003 + \cdots + 1010
   \]

   This is an arithmetic series where the first term \(a = 1001\) and the last term \(l = 1010\). The number of terms \(n = 10\).

   The sum \(S\) of the first \(n\) terms of an arithmetic series is given by:
   \[
   S = \frac{n}{2} (a + l)
   \]

   Substituting the values:
   \[
   S = \frac{10}{2} (1001 + 1010) = 5 \times 2011 = 10055
   \]

2. **Considering permutations:**

   For every permutation \((a_1, a_2, \ldots, a_{1000})\) of \(\{1001, 1002, \ldots, 2000\}\), we need to show that the sum of some ten consecutive terms is greater than or equal to \(A\).

   We need to find the maximum possible value of \(A\) such that for any permutation, the sum of some ten consecutive terms is always at least \(A\).

3. **Upper bound for \(A\):**

   Consider the sum of the smallest 10 consecutive terms in the sequence. The smallest 10 terms are \(1001, 1002, \ldots, 1010\), and their sum is:
   \[
   1001 + 1002 + 1003 + \cdots + 1010 = 10055
   \]

   This sum is the minimum sum of any 10 consecutive terms in the sequence. Therefore, \(A\) must be less than or equal to this sum.

4. **Verification with permutations:**

   To verify, consider the permutation where the terms are arranged in increasing order:
   \[
   (1001, 1002, \ldots, 2000)
   \]

   The sum of the first 10 terms in this permutation is:
   \[
   1001 + 1002 + 1003 + \cdots + 1010 = 10055
   \]

   For any other permutation, the sum of any 10 consecutive terms will be at least \(10055\), as rearranging the terms cannot decrease the sum of any 10 consecutive terms below this value.

5. **Conclusion:**

   Therefore, the greatest positive integer \(A\) such that the sum of some ten consecutive terms in any permutation of \(\{1001, 1002, \ldots, 2000\}\) is always greater than or equal to \(A\) is:
   \[
   A = 10055
   \]

The final answer is \(\boxed{10055}\).