This paper describes the possible radiation sources and their characteristics around 3W1 beamline of Beijing Electron-Positron Collider (BEPC). A homemade monitoring system is used to measure the dose level around 3W1 beamline. The obtained results show that the radiation field depends on the BEPC operation status. During the normal storage operation, the radiation field is a slowly changing field close to a constant. The dose level is proportional to the beram intensity. However when electrons are injected into the storage ring, the radiation field becomes a fast changing field with a very high dose level. Furthermore our results indicate that accidentally the beam loss occurred near to 3W1 beamline, which led to the fast increase of dose level.
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