Let  $n\ge 2$ is a given integer , $x_1,x_2,\ldots,x_n $ be real numbers such that 
$(1) x_1+x_2+\ldots+x_n=0 $,
$(2) |x_i|\le 1$ $(i=1,2,\cdots,n)$.
Find the maximum of Min$\{|x_1-x_2|,|x_2-x_3|,\cdots,|x_{n-1}-x_n|\}$.
To find the maximum of \(\min \{|x_1 - x_2|, |x_2 - x_3|, \ldots, |x_{n-1} - x_n|\}\) given the conditions \(x_1 + x_2 + \ldots + x_n = 0\) and \(|x_i| \leq 1\) for \(i = 1, 2, \ldots, n\), we will consider two cases: when \(n\) is even and when \(n\) is odd.

### Case 1: \(n\) is even
1. **Upper Bound**: 
   \[
   |x_i - x_{i+1}| \leq |x_i| + |x_{i+1}| \leq 2
   \]
   This is because the maximum value of \(|x_i|\) and \(|x_{i+1}|\) is 1.

2. **Construction**:
   Define \(a_k = (-1)^k\) for \(k = 1, 2, \ldots, n\). Then:
   \[
   a_1 + a_2 + \ldots + a_n = 0
   \]
   and
   \[
   |a_i - a_{i+1}| = 2 \quad \text{for} \quad i = 1, 2, \ldots, n-1
   \]
   Therefore, if \(n\) is even, we can achieve:
   \[
   \max \left\{ \min \left\{ |x_i - x_{i+1}| \right\} \right\} = 2
   \]

### Case 2: \(n\) is odd
Let \(n = 2m + 1\).

1. **Upper Bound**:
   We will prove that:
   \[
   \max \left\{ \min \left\{ |x_i - x_{i+1}| \right\} \right\} \leq \frac{n}{\left\lceil \frac{n}{2} \right\rceil}
   \]
   Assume, for contradiction, that there exist numbers \(x_1, x_2, \ldots, x_n\) satisfying the conditions and:
   \[
   \min |x_i - x_{i+1}| > \frac{n}{m+1}
   \]
   Without loss of generality, assume \(x_1 > 0\). Then:
   \[
   x_{2k+1} > 0 \quad \text{and} \quad x_{2k} < 0
   \]
   for \(k = 0, 1, \ldots, m\).

2. **Contradiction**:
   From the assumption:
   \[
   x_1 > \frac{n}{m+1} + x_2
   \]
   and
   \[
   x_{2k+1} > \frac{n}{m+1} + x_{2k} \quad \text{for} \quad k = 1, \ldots, m
   \]
   Summing these inequalities:
   \[
   \sum_{k=1}^{n} x_k > \left( \frac{n}{m+1} + x_2 \right) + x_2 + \ldots + x_{2m} + \left( \frac{n}{m+1} + x_{2m} \right)
   \]
   Simplifying:
   \[
   \sum_{k=1}^{n} x_k > n + x_2 + 2 \sum_{k=1}^{m} x_k \geq 0
   \]
   This contradicts the condition \(x_1 + x_2 + \ldots + x_n = 0\).

3. **Construction**:
   Consider the numbers:
   \[
   x_{2k+1} = \frac{m}{m+1} \quad \text{for} \quad k = 0, 1, \ldots, m
   \]
   and
   \[
   x_{2k} = -1 \quad \text{for} \quad k = 1, \ldots, m
   \]
   These satisfy the conditions and:
   \[
   |x_i - x_{i+1}| = \frac{n}{\left\lceil \frac{n}{2} \right\rceil}
   \]
   Therefore:
   \[
   \max \left\{ \min \left\{ |x_i - x_{i+1}| \right\} \right\} = \frac{n}{\left\lceil \frac{n}{2} \right\rceil}
   \]

\(\blacksquare\)

The final answer is \( \boxed{ \frac{n}{\left\lceil \frac{n}{2} \right\rceil} } \)