Suppose $a_1,a_2,\ldots,a_n>0 $, where $n>1$ and $\sum_{i=1}^{n}a_i=1$. 
For each $i=1,2,\ldots,n $, let $b_i=\frac{a^2_i}{\sum\limits_{j=1}^{n}a^2_j}$. Prove that \[\sum_{i=1}^{n}\frac{a_i}{1-a_i}\le \sum_{i=1}^{n}\frac{b_i}{1-b_i} .\]
When does equality occur ?
1. **Define the given quantities and rewrite the inequality:**
   Given \( a_1, a_2, \ldots, a_n > 0 \) with \( n > 1 \) and \( \sum_{i=1}^{n} a_i = 1 \). For each \( i = 1, 2, \ldots, n \), let \( b_i = \frac{a_i^2}{\sum_{j=1}^{n} a_j^2} \). We need to prove:
   \[
   \sum_{i=1}^{n} \frac{a_i}{1 - a_i} \leq \sum_{i=1}^{n} \frac{b_i}{1 - b_i}.
   \]

2. **Introduce \( S_1 \) and \( S_2 \):**
   Let \( S_1 = \sum_{i=1}^{n} a_i = 1 \) and \( S_2 = \sum_{i=1}^{n} a_i^2 \). Then the inequality can be rewritten as:
   \[
   \sum_{i=1}^{n} \frac{a_i}{S_1 - a_i} \leq \sum_{i=1}^{n} \frac{a_i^2}{S_2 - a_i^2}.
   \]

3. **Transform the inequality:**
   Define \( X \) as:
   \[
   X = \sum_{i=1}^{n} \left( \frac{a_i^2}{S_2 - a_i^2} - \frac{a_i}{S_1 - a_i} \right).
   \]
   We need to show that \( X \geq 0 \).

4. **Simplify \( X \):**
   \[
   X = \sum_{i=1}^{n} \frac{a_i (a_i S_1 - S_2)}{(S_1 - a_i)(S_2 - a_i^2)}.
   \]
   Since \( S_1 = 1 \), this becomes:
   \[
   X = \sum_{i=1}^{n} \frac{a_i (a_i - S_2)}{(1 - a_i)(S_2 - a_i^2)}.
   \]

5. **Express \( X \) as a double sum:**
   \[
   X = \sum_{i=1}^{n} \sum_{j=1}^{n} \frac{a_i a_j (a_i - a_j)}{(1 - a_i)(S_2 - a_i^2)}.
   \]

6. **Symmetrize the expression:**
   \[
   2X = \sum_{i=1}^{n} \sum_{j=1}^{n} \left( \frac{a_i a_j (a_i - a_j)}{(1 - a_i)(S_2 - a_i^2)} + \frac{a_j a_i (a_j - a_i)}{(1 - a_j)(S_2 - a_j^2)} \right).
   \]
   This simplifies to:
   \[
   2X = \sum_{i=1}^{n} \sum_{j=1}^{n} a_i a_j (a_i - a_j) \left( \frac{1}{(1 - a_i)(S_2 - a_i^2)} - \frac{1}{(1 - a_j)(S_2 - a_j^2)} \right).
   \]

7. **Analyze the function \( f(x) = \frac{1}{(1 - x)(S_2 - x^2)} \):**
   The function \( f(x) \) is increasing for \( x < \sqrt{S_2} \). This implies that:
   \[
   \frac{1}{(1 - a_i)(S_2 - a_i^2)} \leq \frac{1}{(1 - a_j)(S_2 - a_j^2)} \quad \text{for} \quad a_i \leq a_j.
   \]
   Therefore, the term \( a_i a_j (a_i - a_j) \left( \frac{1}{(1 - a_i)(S_2 - a_i^2)} - \frac{1}{(1 - a_j)(S_2 - a_j^2)} \right) \) is non-negative.

8. **Conclude the proof:**
   Since each term in the double sum is non-negative, we have \( 2X \geq 0 \), which implies \( X \geq 0 \). Thus, the original inequality holds:
   \[
   \sum_{i=1}^{n} \frac{a_i}{1 - a_i} \leq \sum_{i=1}^{n} \frac{b_i}{1 - b_i}.
   \]

9. **Equality condition:**
   Equality holds if and only if \( a_i = a_j \) for all \( i, j \), which implies \( a_i = \frac{1}{n} \) for all \( i \).

The final answer is \( \boxed{ \sum_{i=1}^{n} \frac{a_i}{1 - a_i} \leq \sum_{i=1}^{n} \frac{b_i}{1 - b_i} } \).