  We consider restricted sumsets over field $F$.
Let\begin{align*}C=\{a_1+\cdots+a_n:a_1\in A_1,\ldots,a_n\in A_n, a_i-a_j\notin
S_{ij}\ \text{if}\ i\not=j\},\end{align*} where $S_{ij}(1\leqslant
i\not=j\leqslant n)$ are finite subsets of $F$ with cardinality $m$, and
$A_1,\ldots, A_n$ are finite nonempty subsets of $F$ with
$|A_1|=\cdots=|A_n|=k$. Let $p(F)$ be the additive order of the identity of
$F$. It is proved that $|C|\geqslant \min\{p(F),\ \ n(k-1)-mn(n-1)+1\}$ if
$p(F)>mn$. This conclusion refines the result of Hou and Sun.
