The present disclosure relates to methods and systems for radiotherapy. Embodiments of the present disclosure may receive a medical image including images of a target and an organ at risk (OAR). Some embodiments may also receive a target dose and a constraint on an OAR dose. Some embodiments may also generate a dose application plan based on the target dose and the constraint. Generation of the dose application plan may include determining a placement of an arc along which radiation is to be applied based on the target dose and a location of the target； dividing the arc into a plurality of segments； determining a dose rate associated with each segment； calculating a predicted OAR dose based on the determined dose rate； and comparing the predicted OAR dose with the constraint on the OAR dose to determine whether the predicted OAR dose satisfies the constraint on the OAR dose.
