Find all positive integers $ n$ such that there exists sequence consisting of $ 1$ and $ - 1: a_{1},a_{2},\cdots,a_{n}$ satisfying $ a_{1}\cdot1^2 + a_{2}\cdot2^2 + \cdots + a_{n}\cdot n^2 = 0.$
To solve the problem, we need to find all positive integers \( n \) such that there exists a sequence consisting of \( 1 \) and \( -1 \), denoted as \( a_1, a_2, \ldots, a_n \), satisfying the equation:
\[
a_1 \cdot 1^2 + a_2 \cdot 2^2 + \cdots + a_n \cdot n^2 = 0.
\]

1. **Initial Observations:**
   - The sum of the squares of the first \( n \) natural numbers is given by:
     \[
     S = 1^2 + 2^2 + \cdots + n^2 = \frac{n(n+1)(2n+1)}{6}.
     \]
   - For the sum to be zero, the positive and negative contributions must cancel each other out.

2. **Modulo 4 Analysis:**
   - We need to consider the sum modulo 4. The squares of numbers modulo 4 are:
     \[
     0^2 \equiv 0, \quad 1^2 \equiv 1, \quad 2^2 \equiv 0, \quad 3^2 \equiv 1 \pmod{4}.
     \]
   - Therefore, the sum of squares modulo 4 depends on the number of terms congruent to 1 and 3 modulo 4.

3. **Necessary Condition:**
   - For the sum to be zero, the number of terms \( n \) must be such that the sum of the squares modulo 4 is zero. This implies:
     \[
     n \equiv 0 \text{ or } 3 \pmod{4}.
     \]

4. **Checking Small Values:**
   - For \( n = 3 \):
     \[
     1^2 + 2^2 + 3^2 = 1 + 4 + 9 = 14 \neq 0.
     \]
   - For \( n = 4 \):
     \[
     1^2 + 2^2 + 3^2 + 4^2 = 1 + 4 + 9 + 16 = 30 \neq 0.
     \]

5. **Constructing Sequences for Larger \( n \):**
   - For \( n = 7 \):
     \[
     1^2 + 2^2 + 4^2 + 7^2 = 1 + 4 + 16 + 49 = 70,
     \]
     \[
     3^2 + 5^2 + 6^2 = 9 + 25 + 36 = 70.
     \]
     Thus, \( n = 7 \) works.
   - For \( n = 8 \):
     \[
     1^2 + 4^2 + 6^2 + 7^2 = 1 + 16 + 36 + 49 = 102,
     \]
     \[
     2^2 + 3^2 + 5^2 + 8^2 = 4 + 9 + 25 + 64 = 102.
     \]
     Thus, \( n = 8 \) works.

6. **General Construction:**
   - If \( n \) works, then \( n + 8 \) also works because:
     \[
     (n+1)^2 + (n+4)^2 + (n+6)^2 + (n+7)^2 = (n+2)^2 + (n+3)^2 + (n+5)^2 + (n+8)^2.
     \]
   - This can be verified by expanding and simplifying both sides.

Conclusion:
The positive integers \( n \) that satisfy the given condition are those such that \( n \equiv 0 \text{ or } 3 \pmod{4} \) and \( n \geq 7 \).

The final answer is \( \boxed{ n \equiv 0 \text{ or } 3 \pmod{4} } \) and \( n \geq 7 \).