  In this paper the 3-way intersection problem for $S(2,4,v)$ designs is
investigated. Let $b_{v}=\frac {v(v-1)}{12}$ and
$I_{3}[v]=\{0,1,...,b_{v}\}\setminus\{b_{v}-7,b_{v}-6,b_{v}-5,b_{v}-4,b_{v}-3,b_{v}-2,b_{v}-1\}$.
Let $J_{3}[v]=\{k|$ there exist three $S(2,4,v)$ designs with $k$ same common
blocks$\}$. We show that $J_{3}[v]\subseteq I_{3}[v]$ for any positive integer
$v\equiv1, 4\ (\rm mod \ 12)$ and $J_{3}[v]=I_{3}[v]$, for $ v\geq49$ and $v=13
$. We find $J_{3}[16]$ completely. Also we determine some values of $J_{3}[v]$
for $\ v=25,28,37$ and 40.
