Two plastic scintillating fiber position detectors for charged particles have been designed,built and installed inside the vacuum tube near two sides of the DM2 deflection magnet on the E3 beam line of the test beam facility at the BEPC-LINAC.A one-dimensional position resolution of～1 mm with a sensitive area of 60 mm×60 mm has been obtained for this detector.
An inbuilt compound target composed of carbon and tungsten is designed, and optimized by realistic GEANT4 Monte Carlo simulation. Also, we do a Monte Carlo study for single-pion photoproduction at the target. The results are presented from the simulation of pion yield, angular distribution and spectrum （at θlab, θcm=41^o）. These efforts are important to the coming measurement of the differential cross section forγ ＋ N →π＋N.
