  By using a specially constructed cone and the fixed point index theory, this
paper investigates the existence of multiple positive solutions for the
third-order three-point singular semipositone BVP: $\begin{cases} x'''(t)-\ld
f(t,x) =0, &t\in(0,1); [.3pc] x(0)=x'(\eta)=x''(1)=0, & \end{cases}$ where
${1/2}<\eta<1$, the non-linear term $f(t,x):(0,1)\times(0,+\i)\to (-\i,+\i)$ is
continuous and may be singular at $t=0$, $t=1$, and $x=0$, also may be negative
for some values of $t$ and $x$, $\ld$ is a positive parameter.
