In this paper, we are concerned with the system of the Schrödinger-Maxwell equations
−
Δ
u
+
λ
V
x
u
+
b
K
x
ϕ
u
=
u
p
−
2
u
,
in
R
3
,
−
Δ
ϕ
=
K
x
u
2
,
in
R
3
,
where
λ
,
b
>
0
are constants, and
3
<
p
<
6
. Under appropriate assumptions on
V
and
K
, we prove the existence of positive solutions in the case
3
<
p
<
4
via the truncation technique. Moreover, suppose that
V
may change sign, we also obtain the multiplicity of solutions for the case
4
<
p
<
6
.