Find all functions $f: \mathbb{Q} \mapsto \mathbb{C}$ satisfying

(i) For any $x_1, x_2, \ldots, x_{1988} \in \mathbb{Q}$, $f(x_{1} + x_{2} + \ldots + x_{1988}) = f(x_1)f(x_2) \ldots f(x_{1988})$.

(ii) $\overline{f(1988)}f(x) = f(1988)\overline{f(x)}$ for all $x \in \mathbb{Q}$.
1. **Assume \( f(x) \neq 0 \) for all \( x \in \mathbb{Q} \):**

   Given the condition (ii) \( \overline{f(1988)}f(x) = f(1988)\overline{f(x)} \) for all \( x \in \mathbb{Q} \), we can deduce that:
   \[
   \frac{f(x)}{\overline{f(x)}} = \frac{f(1988)}{\overline{f(1988)}} = \text{constant}
   \]
   This implies that the ratio \( \frac{f(x)}{\overline{f(x)}} \) is constant for all \( x \in \mathbb{Q} \). 

2. **Express \( f(x) \) in polar form:**

   Let \( f(x) = p(x)e^{i\theta(x)} \), where \( p(x) \) is the magnitude and \( \theta(x) \) is the phase. Then:
   \[
   \frac{p(x)e^{i\theta(x)}}{p(x)e^{-i\theta(x)}} = e^{2i\theta(x)} = \text{constant}
   \]
   This means \( 2i\theta(x) = \text{constant} \mod 2\pi \), so \( \theta(x) = \text{constant} \mod \pi \). Therefore, \( \theta(x) \) is constant for all \( x \in \mathbb{Q} \).

3. **Simplify using the first condition:**

   Consider the first condition \( f(x_1 + x_2 + \ldots + x_{1988}) = f(x_1)f(x_2) \ldots f(x_{1988}) \). Set \( x_1 = x_2 = \ldots = x_{1988} = 0 \):
   \[
   f(0)^{1988} = f(0)
   \]
   This implies \( f(0) \) is one of the 1987th roots of unity, i.e., \( f(0) = e^{\frac{2ki\pi}{1987}} \) for some integer \( k \).

4. **Further analysis with specific values:**

   Set \( x_1 = x_2 = \ldots = x_{1988} = a \):
   \[
   f(a)^{1988} = f(1988a)
   \]
   Now, set \( x_3 = x_4 = \ldots = x_{1988} = a \), \( x_1 = a + b \), \( x_2 = a - b \):
   \[
   f(a)^{1986} f(a+b) f(a-b) = f(1988a)
   \]
   From these two relations, we get:
   \[
   f(a)^2 = f(a+b) f(a-b)
   \]
   Changing variables, we get:
   \[
   f\left(\frac{x+y}{2}\right)^2 = f(x) f(y)
   \]
   This also implies:
   \[
   f\left(\frac{x+y}{2}\right)^2 = f(x+y) f(0)
   \]
   Therefore:
   \[
   f(x+y) f(0) = f(x) f(y)
   \]

5. **Substitute \( f(x) = p(x)e^{i\theta(x)} \):**

   Given \( \theta(x) \) is constant, let \( \theta(x) = \frac{2ki\pi}{1987} \). Then:
   \[
   p(x) e^{\frac{2ki\pi}{1987}} p(y) e^{\frac{2ki\pi}{1987}} = p(x+y) e^{\frac{2ki\pi}{1987}} e^{\frac{2ki\pi}{1987}}
   \]
   Simplifying, we get:
   \[
   p(x) p(y) = p(x+y)
   \]
   This is a Cauchy functional equation for \( p(x) \), and the solutions are \( p(x) = a^x \) for some \( a > 0 \). Thus:
   \[
   f(x) = a^x e^{\frac{2ki\pi}{1987}}
   \]

6. **Consider the case \( f(y) = 0 \) for some \( y \in \mathbb{Q} \):**

   If \( f(y) = 0 \), then using the first condition with \( x_1 = y \), \( x_2 = z - y \), \( x_3 = x_4 = \ldots = x_{1988} = 0 \):
   \[
   f(z) = f(y) f(z-y) f(0)^{1986} = 0
   \]
   This implies \( f(x) = 0 \) for all \( x \in \mathbb{Q} \).

Thus, the solutions are:
\[
f(x) = a^x e^{\frac{2ki\pi}{1987}} \quad \text{for some } a > 0 \text{ and } k \in \mathbb{Z}/_{1987}
\]
or
\[
f(x) = 0 \text{ for all } x \in \mathbb{Q}
\]

The final answer is \( \boxed{ f(x) = a^x e^{\frac{2ki\pi}{1987}} } \) for some \( a > 0 \) and \( k \in \mathbb{Z}/_{1987} \) or \( f(x) = 0 \) for all \( x \in \mathbb{Q} \).